81393820

素因数分解:

$2^2\times 5^1\times {\mathrm{1399}}^1\times {\mathrm{2909}}^1$

素因数の和:4317

約数の個数: 24

約数和(自身を含む): 171108000

約数和(自身を除く): 89714180

約数列:

[1, 2, 4, 5, 10, 20, 1399, 2798, 2909, 5596, 5818, 6995, 11636, 13990, 14545, 27980, 29090, 58180, 4069691, 8139382, 16278764, 20348455, 40696910, 81393820]

約数ペア:

[(1, 81393820), (2, 40696910), (4, 20348455), (5, 16278764), (10, 8139382), (20, 4069691), (1399, 58180), (2798, 29090), (2909, 27980), (5596, 14545), (5818, 13990), (6995, 11636)]