21398870

素因数分解:

$2^1\times 5^1\times {\mathrm{101}}^1\times {\mathrm{21187}}^1$

素因数の和:21295

約数の個数: 16

約数和(自身を含む): 38901168

約数和(自身を除く): 17502298

約数列:

[1, 2, 5, 10, 101, 202, 505, 1010, 21187, 42374, 105935, 211870, 2139887, 4279774, 10699435, 21398870]

約数ペア:

[(1, 21398870), (2, 10699435), (5, 4279774), (10, 2139887), (101, 211870), (202, 105935), (505, 42374), (1010, 21187)]