21401680

素因数分解:

$2^4\times 5^1\times {\mathrm{267521}}^1$

素因数の和:267534

約数の個数: 20

約数和(自身を含む): 49759092

約数和(自身を除く): 28357412

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 267521, 535042, 1070084, 1337605, 2140168, 2675210, 4280336, 5350420, 10700840, 21401680]

約数ペア:

[(1, 21401680), (2, 10700840), (4, 5350420), (5, 4280336), (8, 2675210), (10, 2140168), (16, 1337605), (20, 1070084), (40, 535042), (80, 267521)]