20398460

素因数分解:

$2^2\times 5^1\times {\mathrm{661}}^1\times {\mathrm{1543}}^1$

素因数の和:2213

約数の個数: 24

約数和(自身を含む): 42929376

約数和(自身を除く): 22530916

約数列:

[1, 2, 4, 5, 10, 20, 661, 1322, 1543, 2644, 3086, 3305, 6172, 6610, 7715, 13220, 15430, 30860, 1019923, 2039846, 4079692, 5099615, 10199230, 20398460]

約数ペア:

[(1, 20398460), (2, 10199230), (4, 5099615), (5, 4079692), (10, 2039846), (20, 1019923), (661, 30860), (1322, 15430), (1543, 13220), (2644, 7715), (3086, 6610), (3305, 6172)]