21155855

素因数分解:

$5^1\times 7^1\times {\mathrm{151}}^1\times {\mathrm{4003}}^1$

素因数の和:4166

約数の個数: 16

約数和(自身を含む): 29213184

約数和(自身を除く): 8057329

約数列:

[1, 5, 7, 35, 151, 755, 1057, 4003, 5285, 20015, 28021, 140105, 604453, 3022265, 4231171, 21155855]

約数ペア:

[(1, 21155855), (5, 4231171), (7, 3022265), (35, 604453), (151, 140105), (755, 28021), (1057, 20015), (4003, 5285)]