21405720

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{1499}}^1$

素因数の和:1537

約数の個数: 128

約数和(自身を含む): 77760000

約数和(自身を除く): 56354280

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 17, 20, 21, 24, 28, 30, 34, 35, 40, 42, 51, 56, 60, 68, 70, 84, 85, 102, 105, 119, 120, 136, 140, 168, 170, 204, 210, 238, 255, 280, 340, 357, 408, 420, 476, 510, 595, 680, 714, 840, 952, 1020, 1190, 1428, 1499, 1785, 2040, 2380, 2856, 2998, 3570, 4497, 4760, 5996, 7140, 7495, 8994, 10493, 11992, 14280, 14990, 17988, 20986, 22485, 25483, 29980, 31479, 35976, 41972, 44970, 50966, 52465, 59960, 62958, 76449, 83944, 89940, 101932, 104930, 125916, 127415, 152898, 157395, 178381, 179880, 203864, 209860, 251832, 254830, 305796, 314790, 356762, 382245, 419720, 509660, 535143, 611592, 629580, 713524, 764490, 891905, 1019320, 1070286, 1259160, 1427048, 1528980, 1783810, 2140572, 2675715, 3057960, 3567620, 4281144, 5351430, 7135240, 10702860, 21405720]

約数ペア:

[(1, 21405720), (2, 10702860), (3, 7135240), (4, 5351430), (5, 4281144), (6, 3567620), (7, 3057960), (8, 2675715), (10, 2140572), (12, 1783810), (14, 1528980), (15, 1427048), (17, 1259160), (20, 1070286), (21, 1019320), (24, 891905), (28, 764490), (30, 713524), (34, 629580), (35, 611592), (40, 535143), (42, 509660), (51, 419720), (56, 382245), (60, 356762), (68, 314790), (70, 305796), (84, 254830), (85, 251832), (102, 209860), (105, 203864), (119, 179880), (120, 178381), (136, 157395), (140, 152898), (168, 127415), (170, 125916), (204, 104930), (210, 101932), (238, 89940), (255, 83944), (280, 76449), (340, 62958), (357, 59960), (408, 52465), (420, 50966), (476, 44970), (510, 41972), (595, 35976), (680, 31479), (714, 29980), (840, 25483), (952, 22485), (1020, 20986), (1190, 17988), (1428, 14990), (1499, 14280), (1785, 11992), (2040, 10493), (2380, 8994), (2856, 7495), (2998, 7140), (3570, 5996), (4497, 4760)]