21128675

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{151}}^1\times {\mathrm{193}}^1$

素因数の和:383

約数の個数: 24

約数和(自身を含む): 27423840

約数和(自身を除く): 6295165

約数列:

[1, 5, 25, 29, 145, 151, 193, 725, 755, 965, 3775, 4379, 4825, 5597, 21895, 27985, 29143, 109475, 139925, 145715, 728575, 845147, 4225735, 21128675]

約数ペア:

[(1, 21128675), (5, 4225735), (25, 845147), (29, 728575), (145, 145715), (151, 139925), (193, 109475), (725, 29143), (755, 27985), (965, 21895), (3775, 5597), (4379, 4825)]