21408025

素因数分解:

$5^2\times {\mathrm{53}}^1\times {\mathrm{107}}^1\times {\mathrm{151}}^1$

素因数の和:321

約数の個数: 24

約数和(自身を含む): 27480384

約数和(自身を除く): 6072359

約数列:

[1, 5, 25, 53, 107, 151, 265, 535, 755, 1325, 2675, 3775, 5671, 8003, 16157, 28355, 40015, 80785, 141775, 200075, 403925, 856321, 4281605, 21408025]

約数ペア:

[(1, 21408025), (5, 4281605), (25, 856321), (53, 403925), (107, 200075), (151, 141775), (265, 80785), (535, 40015), (755, 28355), (1325, 16157), (2675, 8003), (3775, 5671)]