21900020

素因数分解:

$2^2\times 5^1\times {\mathrm{149}}^1\times {\mathrm{7349}}^1$

素因数の和:7507

約数の個数: 24

約数和(自身を含む): 46305000

約数和(自身を除く): 24404980

約数列:

[1, 2, 4, 5, 10, 20, 149, 298, 596, 745, 1490, 2980, 7349, 14698, 29396, 36745, 73490, 146980, 1095001, 2190002, 4380004, 5475005, 10950010, 21900020]

約数ペア:

[(1, 21900020), (2, 10950010), (4, 5475005), (5, 4380004), (10, 2190002), (20, 1095001), (149, 146980), (298, 73490), (596, 36745), (745, 29396), (1490, 14698), (2980, 7349)]