21394640

素因数分解:

$2^4\times 5^1\times {\mathrm{267433}}^1$

素因数の和:267446

約数の個数: 20

約数和(自身を含む): 49742724

約数和(自身を除く): 28348084

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267433, 534866, 1069732, 1337165, 2139464, 2674330, 4278928, 5348660, 10697320, 21394640]

約数ペア:

[(1, 21394640), (2, 10697320), (4, 5348660), (5, 4278928), (8, 2674330), (10, 2139464), (16, 1337165), (20, 1069732), (40, 534866), (80, 267433)]