21720675

素因数分解:

$3^1\times 5^2\times {\mathrm{71}}^1\times {\mathrm{4079}}^1$

素因数の和:4163

約数の個数: 24

約数和(自身を含む): 36426240

約数和(自身を除く): 14705565

約数列:

[1, 3, 5, 15, 25, 71, 75, 213, 355, 1065, 1775, 4079, 5325, 12237, 20395, 61185, 101975, 289609, 305925, 868827, 1448045, 4344135, 7240225, 21720675]

約数ペア:

[(1, 21720675), (3, 7240225), (5, 4344135), (15, 1448045), (25, 868827), (71, 305925), (75, 289609), (213, 101975), (355, 61185), (1065, 20395), (1775, 12237), (4079, 5325)]