21387040

素因数分解:

$2^5\times 5^1\times {\mathrm{133669}}^1$

素因数の和:133684

約数の個数: 24

約数和(自身を含む): 50527260

約数和(自身を除く): 29140220

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 133669, 267338, 534676, 668345, 1069352, 1336690, 2138704, 2673380, 4277408, 5346760, 10693520, 21387040]

約数ペア:

[(1, 21387040), (2, 10693520), (4, 5346760), (5, 4277408), (8, 2673380), (10, 2138704), (16, 1336690), (20, 1069352), (32, 668345), (40, 534676), (80, 267338), (160, 133669)]