21079660

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{17}}^2\times {\mathrm{521}}^1$

素因数の和:571

約数の個数: 72

約数和(自身を含む): 53845344

約数和(自身を除く): 32765684

約数列:

[1, 2, 4, 5, 7, 10, 14, 17, 20, 28, 34, 35, 68, 70, 85, 119, 140, 170, 238, 289, 340, 476, 521, 578, 595, 1042, 1156, 1190, 1445, 2023, 2084, 2380, 2605, 2890, 3647, 4046, 5210, 5780, 7294, 8092, 8857, 10115, 10420, 14588, 17714, 18235, 20230, 35428, 36470, 40460, 44285, 61999, 72940, 88570, 123998, 150569, 177140, 247996, 301138, 309995, 602276, 619990, 752845, 1053983, 1239980, 1505690, 2107966, 3011380, 4215932, 5269915, 10539830, 21079660]

約数ペア:

[(1, 21079660), (2, 10539830), (4, 5269915), (5, 4215932), (7, 3011380), (10, 2107966), (14, 1505690), (17, 1239980), (20, 1053983), (28, 752845), (34, 619990), (35, 602276), (68, 309995), (70, 301138), (85, 247996), (119, 177140), (140, 150569), (170, 123998), (238, 88570), (289, 72940), (340, 61999), (476, 44285), (521, 40460), (578, 36470), (595, 35428), (1042, 20230), (1156, 18235), (1190, 17714), (1445, 14588), (2023, 10420), (2084, 10115), (2380, 8857), (2605, 8092), (2890, 7294), (3647, 5780), (4046, 5210)]