21194920

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{439}}^1$

素因数の和:538

約数の個数: 64

約数和(自身を含む): 51321600

約数和(自身を除く): 30126680

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 71, 85, 136, 142, 170, 284, 340, 355, 439, 568, 680, 710, 878, 1207, 1420, 1756, 2195, 2414, 2840, 3512, 4390, 4828, 6035, 7463, 8780, 9656, 12070, 14926, 17560, 24140, 29852, 31169, 37315, 48280, 59704, 62338, 74630, 124676, 149260, 155845, 249352, 298520, 311690, 529873, 623380, 1059746, 1246760, 2119492, 2649365, 4238984, 5298730, 10597460, 21194920]

約数ペア:

[(1, 21194920), (2, 10597460), (4, 5298730), (5, 4238984), (8, 2649365), (10, 2119492), (17, 1246760), (20, 1059746), (34, 623380), (40, 529873), (68, 311690), (71, 298520), (85, 249352), (136, 155845), (142, 149260), (170, 124676), (284, 74630), (340, 62338), (355, 59704), (439, 48280), (568, 37315), (680, 31169), (710, 29852), (878, 24140), (1207, 17560), (1420, 14926), (1756, 12070), (2195, 9656), (2414, 8780), (2840, 7463), (3512, 6035), (4390, 4828)]