21378640

素因数分解:

$2^4\times 5^1\times {\mathrm{267233}}^1$

素因数の和:267246

約数の個数: 20

約数和(自身を含む): 49705524

約数和(自身を除く): 28326884

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267233, 534466, 1068932, 1336165, 2137864, 2672330, 4275728, 5344660, 10689320, 21378640]

約数ペア:

[(1, 21378640), (2, 10689320), (4, 5344660), (5, 4275728), (8, 2672330), (10, 2137864), (16, 1336165), (20, 1068932), (40, 534466), (80, 267233)]