21281020

素因数分解:

$2^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{13469}}^1$

素因数の和:13557

約数の個数: 24

約数和(自身を含む): 45259200

約数和(自身を除く): 23978180

約数列:

[1, 2, 4, 5, 10, 20, 79, 158, 316, 395, 790, 1580, 13469, 26938, 53876, 67345, 134690, 269380, 1064051, 2128102, 4256204, 5320255, 10640510, 21281020]

約数ペア:

[(1, 21281020), (2, 10640510), (4, 5320255), (5, 4256204), (10, 2128102), (20, 1064051), (79, 269380), (158, 134690), (316, 67345), (395, 53876), (790, 26938), (1580, 13469)]