21161810

素因数分解:

$2^1\times 5^1\times {\mathrm{251}}^1\times {\mathrm{8431}}^1$

素因数の和:8689

約数の個数: 16

約数和(自身を含む): 38247552

約数和(自身を除く): 17085742

約数列:

[1, 2, 5, 10, 251, 502, 1255, 2510, 8431, 16862, 42155, 84310, 2116181, 4232362, 10580905, 21161810]

約数ペア:

[(1, 21161810), (2, 10580905), (5, 4232362), (10, 2116181), (251, 84310), (502, 42155), (1255, 16862), (2510, 8431)]