19980325

素因数分解:

$5^2\times {\mathrm{41}}^1\times {\mathrm{101}}^1\times {\mathrm{193}}^1$

素因数の和:345

約数の個数: 24

約数和(自身を含む): 25763976

約数和(自身を除く): 5783651

約数列:

[1, 5, 25, 41, 101, 193, 205, 505, 965, 1025, 2525, 4141, 4825, 7913, 19493, 20705, 39565, 97465, 103525, 197825, 487325, 799213, 3996065, 19980325]

約数ペア:

[(1, 19980325), (5, 3996065), (25, 799213), (41, 487325), (101, 197825), (193, 103525), (205, 97465), (505, 39565), (965, 20705), (1025, 19493), (2525, 7913), (4141, 4825)]