81507920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{181}}^1\times {\mathrm{433}}^1$

素因数の和:640

約数の個数: 80

約数和(自身を含む): 205684752

約数和(自身を除く): 124176832

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 181, 208, 260, 362, 433, 520, 724, 866, 905, 1040, 1448, 1732, 1810, 2165, 2353, 2896, 3464, 3620, 4330, 4706, 5629, 6928, 7240, 8660, 9412, 11258, 11765, 14480, 17320, 18824, 22516, 23530, 28145, 34640, 37648, 45032, 47060, 56290, 78373, 90064, 94120, 112580, 156746, 188240, 225160, 313492, 391865, 450320, 626984, 783730, 1018849, 1253968, 1567460, 2037698, 3134920, 4075396, 5094245, 6269840, 8150792, 10188490, 16301584, 20376980, 40753960, 81507920]

約数ペア:

[(1, 81507920), (2, 40753960), (4, 20376980), (5, 16301584), (8, 10188490), (10, 8150792), (13, 6269840), (16, 5094245), (20, 4075396), (26, 3134920), (40, 2037698), (52, 1567460), (65, 1253968), (80, 1018849), (104, 783730), (130, 626984), (181, 450320), (208, 391865), (260, 313492), (362, 225160), (433, 188240), (520, 156746), (724, 112580), (866, 94120), (905, 90064), (1040, 78373), (1448, 56290), (1732, 47060), (1810, 45032), (2165, 37648), (2353, 34640), (2896, 28145), (3464, 23530), (3620, 22516), (4330, 18824), (4706, 17320), (5629, 14480), (6928, 11765), (7240, 11258), (8660, 9412)]