21399880

素因数分解:

$2^3\times 5^1\times {\mathrm{101}}^1\times {\mathrm{5297}}^1$

素因数の和:5409

約数の個数: 32

約数和(自身を含む): 48635640

約数和(自身を除く): 27235760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 101, 202, 404, 505, 808, 1010, 2020, 4040, 5297, 10594, 21188, 26485, 42376, 52970, 105940, 211880, 534997, 1069994, 2139988, 2674985, 4279976, 5349970, 10699940, 21399880]

約数ペア:

[(1, 21399880), (2, 10699940), (4, 5349970), (5, 4279976), (8, 2674985), (10, 2139988), (20, 1069994), (40, 534997), (101, 211880), (202, 105940), (404, 52970), (505, 42376), (808, 26485), (1010, 21188), (2020, 10594), (4040, 5297)]