21378920

素因数分解:

$2^3\times 5^1\times {\mathrm{534473}}^1$

素因数の和:534484

約数の個数: 16

約数和(自身を含む): 48102660

約数和(自身を除く): 26723740

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 534473, 1068946, 2137892, 2672365, 4275784, 5344730, 10689460, 21378920]

約数ペア:

[(1, 21378920), (2, 10689460), (4, 5344730), (5, 4275784), (8, 2672365), (10, 2137892), (20, 1068946), (40, 534473)]