21111960

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{131}}^1$

素因数の和:241

約数の個数: 128

約数和(自身を含む): 68428800

約数和(自身を除く): 47316840

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17, 20, 24, 30, 34, 40, 51, 60, 68, 79, 85, 102, 120, 131, 136, 158, 170, 204, 237, 255, 262, 316, 340, 393, 395, 408, 474, 510, 524, 632, 655, 680, 786, 790, 948, 1020, 1048, 1185, 1310, 1343, 1572, 1580, 1896, 1965, 2040, 2227, 2370, 2620, 2686, 3144, 3160, 3930, 4029, 4454, 4740, 5240, 5372, 6681, 6715, 7860, 8058, 8908, 9480, 10349, 10744, 11135, 13362, 13430, 15720, 16116, 17816, 20145, 20698, 22270, 26724, 26860, 31047, 32232, 33405, 40290, 41396, 44540, 51745, 53448, 53720, 62094, 66810, 80580, 82792, 89080, 103490, 124188, 133620, 155235, 161160, 175933, 206980, 248376, 267240, 310470, 351866, 413960, 527799, 620940, 703732, 879665, 1055598, 1241880, 1407464, 1759330, 2111196, 2638995, 3518660, 4222392, 5277990, 7037320, 10555980, 21111960]

約数ペア:

[(1, 21111960), (2, 10555980), (3, 7037320), (4, 5277990), (5, 4222392), (6, 3518660), (8, 2638995), (10, 2111196), (12, 1759330), (15, 1407464), (17, 1241880), (20, 1055598), (24, 879665), (30, 703732), (34, 620940), (40, 527799), (51, 413960), (60, 351866), (68, 310470), (79, 267240), (85, 248376), (102, 206980), (120, 175933), (131, 161160), (136, 155235), (158, 133620), (170, 124188), (204, 103490), (237, 89080), (255, 82792), (262, 80580), (316, 66810), (340, 62094), (393, 53720), (395, 53448), (408, 51745), (474, 44540), (510, 41396), (524, 40290), (632, 33405), (655, 32232), (680, 31047), (786, 26860), (790, 26724), (948, 22270), (1020, 20698), (1048, 20145), (1185, 17816), (1310, 16116), (1343, 15720), (1572, 13430), (1580, 13362), (1896, 11135), (1965, 10744), (2040, 10349), (2227, 9480), (2370, 8908), (2620, 8058), (2686, 7860), (3144, 6715), (3160, 6681), (3930, 5372), (4029, 5240), (4454, 4740)]