21784325

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{53}}^1\times {\mathrm{401}}^1$

素因数の和:505

約数の個数: 24

約数和(自身を含む): 28263816

約数和(自身を除く): 6479491

約数列:

[1, 5, 25, 41, 53, 205, 265, 401, 1025, 1325, 2005, 2173, 10025, 10865, 16441, 21253, 54325, 82205, 106265, 411025, 531325, 871373, 4356865, 21784325]

約数ペア:

[(1, 21784325), (5, 4356865), (25, 871373), (41, 531325), (53, 411025), (205, 106265), (265, 82205), (401, 54325), (1025, 21253), (1325, 16441), (2005, 10865), (2173, 10025)]