81377920

素因数分解:

$2^7\times 5^1\times {\mathrm{13}}^1\times {\mathrm{9781}}^1$

素因数の和:9813

約数の個数: 64

約数和(自身を含む): 209530440

約数和(自身を除く): 128152520

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 260, 320, 416, 520, 640, 832, 1040, 1664, 2080, 4160, 8320, 9781, 19562, 39124, 48905, 78248, 97810, 127153, 156496, 195620, 254306, 312992, 391240, 508612, 625984, 635765, 782480, 1017224, 1251968, 1271530, 1564960, 2034448, 2543060, 3129920, 4068896, 5086120, 6259840, 8137792, 10172240, 16275584, 20344480, 40688960, 81377920]

約数ペア:

[(1, 81377920), (2, 40688960), (4, 20344480), (5, 16275584), (8, 10172240), (10, 8137792), (13, 6259840), (16, 5086120), (20, 4068896), (26, 3129920), (32, 2543060), (40, 2034448), (52, 1564960), (64, 1271530), (65, 1251968), (80, 1017224), (104, 782480), (128, 635765), (130, 625984), (160, 508612), (208, 391240), (260, 312992), (320, 254306), (416, 195620), (520, 156496), (640, 127153), (832, 97810), (1040, 78248), (1664, 48905), (2080, 39124), (4160, 19562), (8320, 9781)]