21428560

素因数分解:

$2^4\times 5^1\times {\mathrm{267857}}^1$

素因数の和:267870

約数の個数: 20

約数和(自身を含む): 49821588

約数和(自身を除く): 28393028

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267857, 535714, 1071428, 1339285, 2142856, 2678570, 4285712, 5357140, 10714280, 21428560]

約数ペア:

[(1, 21428560), (2, 10714280), (4, 5357140), (5, 4285712), (8, 2678570), (10, 2142856), (16, 1339285), (20, 1071428), (40, 535714), (80, 267857)]