21780620

素因数分解:

$2^2\times 5^1\times {\mathrm{457}}^1\times {\mathrm{2383}}^1$

素因数の和:2849

約数の個数: 24

約数和(自身を含む): 45858624

約数和(自身を除く): 24078004

約数列:

[1, 2, 4, 5, 10, 20, 457, 914, 1828, 2285, 2383, 4570, 4766, 9140, 9532, 11915, 23830, 47660, 1089031, 2178062, 4356124, 5445155, 10890310, 21780620]

約数ペア:

[(1, 21780620), (2, 10890310), (4, 5445155), (5, 4356124), (10, 2178062), (20, 1089031), (457, 47660), (914, 23830), (1828, 11915), (2285, 9532), (2383, 9140), (4570, 4766)]