19919090

素因数分解:

$2^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{22381}}^1$

素因数の和:22477

約数の個数: 16

約数和(自身を含む): 36258840

約数和(自身を除く): 16339750

約数列:

[1, 2, 5, 10, 89, 178, 445, 890, 22381, 44762, 111905, 223810, 1991909, 3983818, 9959545, 19919090]

約数ペア:

[(1, 19919090), (2, 9959545), (5, 3983818), (10, 1991909), (89, 223810), (178, 111905), (445, 44762), (890, 22381)]