21056440

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{16981}}^1$

素因数の和:17023

約数の個数: 32

約数和(自身を含む): 48908160

約数和(自身を除く): 27851720

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 16981, 33962, 67924, 84905, 135848, 169810, 339620, 526411, 679240, 1052822, 2105644, 2632055, 4211288, 5264110, 10528220, 21056440]

約数ペア:

[(1, 21056440), (2, 10528220), (4, 5264110), (5, 4211288), (8, 2632055), (10, 2105644), (20, 1052822), (31, 679240), (40, 526411), (62, 339620), (124, 169810), (155, 135848), (248, 84905), (310, 67924), (620, 33962), (1240, 16981)]