81781640

素因数分解:

$2^3\times 5^1\times {\mathrm{2044541}}^1$

素因数の和:2044552

約数の個数: 16

約数和(自身を含む): 184008780

約数和(自身を除く): 102227140

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 2044541, 4089082, 8178164, 10222705, 16356328, 20445410, 40890820, 81781640]

約数ペア:

[(1, 81781640), (2, 40890820), (4, 20445410), (5, 16356328), (8, 10222705), (10, 8178164), (20, 4089082), (40, 2044541)]