31915280

素因数分解:

$2^4\times 5^1\times {\mathrm{398941}}^1$

素因数の和:398954

約数の個数: 20

約数和(自身を含む): 74203212

約数和(自身を除く): 42287932

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 398941, 797882, 1595764, 1994705, 3191528, 3989410, 6383056, 7978820, 15957640, 31915280]

約数ペア:

[(1, 31915280), (2, 15957640), (4, 7978820), (5, 6383056), (8, 3989410), (10, 3191528), (16, 1994705), (20, 1595764), (40, 797882), (80, 398941)]