20518160

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{181}}^1$

素因数の和:316

約数の個数: 80

約数和(自身を含む): 52132080

約数和(自身を除く): 31613920

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 109, 130, 181, 208, 218, 260, 362, 436, 520, 545, 724, 872, 905, 1040, 1090, 1417, 1448, 1744, 1810, 2180, 2353, 2834, 2896, 3620, 4360, 4706, 5668, 7085, 7240, 8720, 9412, 11336, 11765, 14170, 14480, 18824, 19729, 22672, 23530, 28340, 37648, 39458, 47060, 56680, 78916, 94120, 98645, 113360, 157832, 188240, 197290, 256477, 315664, 394580, 512954, 789160, 1025908, 1282385, 1578320, 2051816, 2564770, 4103632, 5129540, 10259080, 20518160]

約数ペア:

[(1, 20518160), (2, 10259080), (4, 5129540), (5, 4103632), (8, 2564770), (10, 2051816), (13, 1578320), (16, 1282385), (20, 1025908), (26, 789160), (40, 512954), (52, 394580), (65, 315664), (80, 256477), (104, 197290), (109, 188240), (130, 157832), (181, 113360), (208, 98645), (218, 94120), (260, 78916), (362, 56680), (436, 47060), (520, 39458), (545, 37648), (724, 28340), (872, 23530), (905, 22672), (1040, 19729), (1090, 18824), (1417, 14480), (1448, 14170), (1744, 11765), (1810, 11336), (2180, 9412), (2353, 8720), (2834, 7240), (2896, 7085), (3620, 5668), (4360, 4706)]