21139575

素因数分解:

$3^1\times 5^2\times {\mathrm{521}}^1\times {\mathrm{541}}^1$

素因数の和:1075

約数の個数: 24

約数和(自身を含む): 35082576

約数和(自身を除く): 13943001

約数列:

[1, 3, 5, 15, 25, 75, 521, 541, 1563, 1623, 2605, 2705, 7815, 8115, 13025, 13525, 39075, 40575, 281861, 845583, 1409305, 4227915, 7046525, 21139575]

約数ペア:

[(1, 21139575), (3, 7046525), (5, 4227915), (15, 1409305), (25, 845583), (75, 281861), (521, 40575), (541, 39075), (1563, 13525), (1623, 13025), (2605, 8115), (2705, 7815)]