21705425

素因数分解:

$5^2\times 7^1\times {\mathrm{31}}^1\times {\mathrm{4001}}^1$

素因数の和:4049

約数の個数: 24

約数和(自身を含む): 31759872

約数和(自身を除く): 10054447

約数列:

[1, 5, 7, 25, 31, 35, 155, 175, 217, 775, 1085, 4001, 5425, 20005, 28007, 100025, 124031, 140035, 620155, 700175, 868217, 3100775, 4341085, 21705425]

約数ペア:

[(1, 21705425), (5, 4341085), (7, 3100775), (25, 868217), (31, 700175), (35, 620155), (155, 140035), (175, 124031), (217, 100025), (775, 28007), (1085, 20005), (4001, 5425)]