21032720

素因数分解:

$2^4\times 5^1\times {\mathrm{262909}}^1$

素因数の和:262922

約数の個数: 20

約数和(自身を含む): 48901260

約数和(自身を除く): 27868540

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262909, 525818, 1051636, 1314545, 2103272, 2629090, 4206544, 5258180, 10516360, 21032720]

約数ペア:

[(1, 21032720), (2, 10516360), (4, 5258180), (5, 4206544), (8, 2629090), (10, 2103272), (16, 1314545), (20, 1051636), (40, 525818), (80, 262909)]