21087790

素因数分解:

$2^1\times 5^1\times {\mathrm{101}}^1\times {\mathrm{20879}}^1$

素因数の和:20987

約数の個数: 16

約数和(自身を含む): 38335680

約数和(自身を除く): 17247890

約数列:

[1, 2, 5, 10, 101, 202, 505, 1010, 20879, 41758, 104395, 208790, 2108779, 4217558, 10543895, 21087790]

約数ペア:

[(1, 21087790), (2, 10543895), (5, 4217558), (10, 2108779), (101, 208790), (202, 104395), (505, 41758), (1010, 20879)]