20808680

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{431}}^1$

素因数の和:530

約数の個数: 64

約数和(自身を含む): 50388480

約数和(自身を除く): 29579800

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 71, 85, 136, 142, 170, 284, 340, 355, 431, 568, 680, 710, 862, 1207, 1420, 1724, 2155, 2414, 2840, 3448, 4310, 4828, 6035, 7327, 8620, 9656, 12070, 14654, 17240, 24140, 29308, 30601, 36635, 48280, 58616, 61202, 73270, 122404, 146540, 153005, 244808, 293080, 306010, 520217, 612020, 1040434, 1224040, 2080868, 2601085, 4161736, 5202170, 10404340, 20808680]

約数ペア:

[(1, 20808680), (2, 10404340), (4, 5202170), (5, 4161736), (8, 2601085), (10, 2080868), (17, 1224040), (20, 1040434), (34, 612020), (40, 520217), (68, 306010), (71, 293080), (85, 244808), (136, 153005), (142, 146540), (170, 122404), (284, 73270), (340, 61202), (355, 58616), (431, 48280), (568, 36635), (680, 30601), (710, 29308), (862, 24140), (1207, 17240), (1420, 14654), (1724, 12070), (2155, 9656), (2414, 8620), (2840, 7327), (3448, 6035), (4310, 4828)]