21780720

素因数分解:

$2^4\times 3^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{179}}^1$

素因数の和:224

約数の個数: 180

約数和(自身を含む): 79648920

約数和(自身を除く): 57868200

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 13, 15, 16, 18, 20, 24, 26, 30, 36, 39, 40, 45, 48, 52, 60, 65, 72, 78, 80, 90, 104, 117, 120, 130, 144, 156, 169, 179, 180, 195, 208, 234, 240, 260, 312, 338, 358, 360, 390, 468, 507, 520, 537, 585, 624, 676, 716, 720, 780, 845, 895, 936, 1014, 1040, 1074, 1170, 1352, 1432, 1521, 1560, 1611, 1690, 1790, 1872, 2028, 2148, 2327, 2340, 2535, 2685, 2704, 2864, 3042, 3120, 3222, 3380, 3580, 4056, 4296, 4654, 4680, 5070, 5370, 6084, 6444, 6760, 6981, 7160, 7605, 8055, 8112, 8592, 9308, 9360, 10140, 10740, 11635, 12168, 12888, 13520, 13962, 14320, 15210, 16110, 18616, 20280, 20943, 21480, 23270, 24336, 25776, 27924, 30251, 30420, 32220, 34905, 37232, 40560, 41886, 42960, 46540, 55848, 60502, 60840, 64440, 69810, 83772, 90753, 93080, 104715, 111696, 121004, 121680, 128880, 139620, 151255, 167544, 181506, 186160, 209430, 242008, 272259, 279240, 302510, 335088, 363012, 418860, 453765, 484016, 544518, 558480, 605020, 726024, 837720, 907530, 1089036, 1210040, 1361295, 1452048, 1675440, 1815060, 2178072, 2420080, 2722590, 3630120, 4356144, 5445180, 7260240, 10890360, 21780720]

約数ペア:

[(1, 21780720), (2, 10890360), (3, 7260240), (4, 5445180), (5, 4356144), (6, 3630120), (8, 2722590), (9, 2420080), (10, 2178072), (12, 1815060), (13, 1675440), (15, 1452048), (16, 1361295), (18, 1210040), (20, 1089036), (24, 907530), (26, 837720), (30, 726024), (36, 605020), (39, 558480), (40, 544518), (45, 484016), (48, 453765), (52, 418860), (60, 363012), (65, 335088), (72, 302510), (78, 279240), (80, 272259), (90, 242008), (104, 209430), (117, 186160), (120, 181506), (130, 167544), (144, 151255), (156, 139620), (169, 128880), (179, 121680), (180, 121004), (195, 111696), (208, 104715), (234, 93080), (240, 90753), (260, 83772), (312, 69810), (338, 64440), (358, 60840), (360, 60502), (390, 55848), (468, 46540), (507, 42960), (520, 41886), (537, 40560), (585, 37232), (624, 34905), (676, 32220), (716, 30420), (720, 30251), (780, 27924), (845, 25776), (895, 24336), (936, 23270), (1014, 21480), (1040, 20943), (1074, 20280), (1170, 18616), (1352, 16110), (1432, 15210), (1521, 14320), (1560, 13962), (1611, 13520), (1690, 12888), (1790, 12168), (1872, 11635), (2028, 10740), (2148, 10140), (2327, 9360), (2340, 9308), (2535, 8592), (2685, 8112), (2704, 8055), (2864, 7605), (3042, 7160), (3120, 6981), (3222, 6760), (3380, 6444), (3580, 6084), (4056, 5370), (4296, 5070), (4654, 4680)]