21009985

素因数分解:

$5^1\times {\mathrm{107}}^1\times {\mathrm{173}}^1\times {\mathrm{227}}^1$

素因数の和:512

約数の個数: 16

約数和(自身を含む): 25707456

約数和(自身を除く): 4697471

約数列:

[1, 5, 107, 173, 227, 535, 865, 1135, 18511, 24289, 39271, 92555, 121445, 196355, 4201997, 21009985]

約数ペア:

[(1, 21009985), (5, 4201997), (107, 196355), (173, 121445), (227, 92555), (535, 39271), (865, 24289), (1135, 18511)]