21019420

素因数分解:

$2^2\times 5^1\times {\mathrm{823}}^1\times {\mathrm{1277}}^1$

素因数の和:2109

約数の個数: 24

約数和(自身を含む): 44229024

約数和(自身を除く): 23209604

約数列:

[1, 2, 4, 5, 10, 20, 823, 1277, 1646, 2554, 3292, 4115, 5108, 6385, 8230, 12770, 16460, 25540, 1050971, 2101942, 4203884, 5254855, 10509710, 21019420]

約数ペア:

[(1, 21019420), (2, 10509710), (4, 5254855), (5, 4203884), (10, 2101942), (20, 1050971), (823, 25540), (1277, 16460), (1646, 12770), (2554, 8230), (3292, 6385), (4115, 5108)]