21297160

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{7499}}^1$

素因数の和:7581

約数の個数: 32

約数和(自身を含む): 48600000

約数和(自身を除く): 27302840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 142, 284, 355, 568, 710, 1420, 2840, 7499, 14998, 29996, 37495, 59992, 74990, 149980, 299960, 532429, 1064858, 2129716, 2662145, 4259432, 5324290, 10648580, 21297160]

約数ペア:

[(1, 21297160), (2, 10648580), (4, 5324290), (5, 4259432), (8, 2662145), (10, 2129716), (20, 1064858), (40, 532429), (71, 299960), (142, 149980), (284, 74990), (355, 59992), (568, 37495), (710, 29996), (1420, 14998), (2840, 7499)]