16640980

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{11719}}^1$

素因数の和:11799

約数の個数: 24

約数和(自身を含む): 35441280

約数和(自身を除く): 18800300

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 11719, 23438, 46876, 58595, 117190, 234380, 832049, 1664098, 3328196, 4160245, 8320490, 16640980]

約数ペア:

[(1, 16640980), (2, 8320490), (4, 4160245), (5, 3328196), (10, 1664098), (20, 832049), (71, 234380), (142, 117190), (284, 58595), (355, 46876), (710, 23438), (1420, 11719)]