399455180

素因数分解:

$2^2\times 5^1\times {\mathrm{1249}}^1\times {\mathrm{15991}}^1$

素因数の和:17249

約数の個数: 24

約数和(自身を含む): 839580000

約数和(自身を除く): 440124820

約数列:

[1, 2, 4, 5, 10, 20, 1249, 2498, 4996, 6245, 12490, 15991, 24980, 31982, 63964, 79955, 159910, 319820, 19972759, 39945518, 79891036, 99863795, 199727590, 399455180]

約数ペア:

[(1, 399455180), (2, 199727590), (4, 99863795), (5, 79891036), (10, 39945518), (20, 19972759), (1249, 319820), (2498, 159910), (4996, 79955), (6245, 63964), (12490, 31982), (15991, 24980)]