21400075

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{521}}^1$

素因数の和:615

約数の個数: 24

約数和(自身を含む): 27962496

約数和(自身を除く): 6562421

約数列:

[1, 5, 25, 31, 53, 155, 265, 521, 775, 1325, 1643, 2605, 8215, 13025, 16151, 27613, 41075, 80755, 138065, 403775, 690325, 856003, 4280015, 21400075]

約数ペア:

[(1, 21400075), (5, 4280015), (25, 856003), (31, 690325), (53, 403775), (155, 138065), (265, 80755), (521, 41075), (775, 27613), (1325, 16151), (1643, 13025), (2605, 8215)]