21247815

素因数分解:

$3^1\times 5^1\times {\mathrm{71}}^2\times {\mathrm{281}}^1$

素因数の和:431

約数の個数: 24

約数和(自身を含む): 34604784

約数和(自身を除く): 13356969

約数列:

[1, 3, 5, 15, 71, 213, 281, 355, 843, 1065, 1405, 4215, 5041, 15123, 19951, 25205, 59853, 75615, 99755, 299265, 1416521, 4249563, 7082605, 21247815]

約数ペア:

[(1, 21247815), (3, 7082605), (5, 4249563), (15, 1416521), (71, 299265), (213, 99755), (281, 75615), (355, 59853), (843, 25205), (1065, 19951), (1405, 15123), (4215, 5041)]