19788980

素因数分解:

$2^2\times 5^1\times {\mathrm{971}}^1\times {\mathrm{1019}}^1$

素因数の和:1999

約数の個数: 24

約数和(自身を含む): 41640480

約数和(自身を除く): 21851500

約数列:

[1, 2, 4, 5, 10, 20, 971, 1019, 1942, 2038, 3884, 4076, 4855, 5095, 9710, 10190, 19420, 20380, 989449, 1978898, 3957796, 4947245, 9894490, 19788980]

約数ペア:

[(1, 19788980), (2, 9894490), (4, 4947245), (5, 3957796), (10, 1978898), (20, 989449), (971, 20380), (1019, 19420), (1942, 10190), (2038, 9710), (3884, 5095), (4076, 4855)]