20891000

素因数分解:

$2^3\times 5^3\times {\mathrm{13}}^1\times {\mathrm{1607}}^1$

素因数の和:1641

約数の個数: 64

約数和(自身を含む): 52678080

約数和(自身を除く): 31787080

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 40, 50, 52, 65, 100, 104, 125, 130, 200, 250, 260, 325, 500, 520, 650, 1000, 1300, 1607, 1625, 2600, 3214, 3250, 6428, 6500, 8035, 12856, 13000, 16070, 20891, 32140, 40175, 41782, 64280, 80350, 83564, 104455, 160700, 167128, 200875, 208910, 321400, 401750, 417820, 522275, 803500, 835640, 1044550, 1607000, 2089100, 2611375, 4178200, 5222750, 10445500, 20891000]

約数ペア:

[(1, 20891000), (2, 10445500), (4, 5222750), (5, 4178200), (8, 2611375), (10, 2089100), (13, 1607000), (20, 1044550), (25, 835640), (26, 803500), (40, 522275), (50, 417820), (52, 401750), (65, 321400), (100, 208910), (104, 200875), (125, 167128), (130, 160700), (200, 104455), (250, 83564), (260, 80350), (325, 64280), (500, 41782), (520, 40175), (650, 32140), (1000, 20891), (1300, 16070), (1607, 13000), (1625, 12856), (2600, 8035), (3214, 6500), (3250, 6428)]