20321920

素因数分解:

$2^7\times 5^1\times {\mathrm{113}}^1\times {\mathrm{281}}^1$

素因数の和:413

約数の個数: 64

約数和(自身を含む): 49186440

約数和(自身を除く): 28864520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 113, 128, 160, 226, 281, 320, 452, 562, 565, 640, 904, 1124, 1130, 1405, 1808, 2248, 2260, 2810, 3616, 4496, 4520, 5620, 7232, 8992, 9040, 11240, 14464, 17984, 18080, 22480, 31753, 35968, 36160, 44960, 63506, 72320, 89920, 127012, 158765, 179840, 254024, 317530, 508048, 635060, 1016096, 1270120, 2032192, 2540240, 4064384, 5080480, 10160960, 20321920]

約数ペア:

[(1, 20321920), (2, 10160960), (4, 5080480), (5, 4064384), (8, 2540240), (10, 2032192), (16, 1270120), (20, 1016096), (32, 635060), (40, 508048), (64, 317530), (80, 254024), (113, 179840), (128, 158765), (160, 127012), (226, 89920), (281, 72320), (320, 63506), (452, 44960), (562, 36160), (565, 35968), (640, 31753), (904, 22480), (1124, 18080), (1130, 17984), (1405, 14464), (1808, 11240), (2248, 9040), (2260, 8992), (2810, 7232), (3616, 5620), (4496, 4520)]