19870979905

素因数分解:

$5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{1223}}^1\times {\mathrm{4507}}^1$

素因数の和:5845

約数の個数: 32

約数和(自身を含む): 27544817664

約数和(自身を除く): 7673837759

約数列:

[1, 5, 7, 35, 103, 515, 721, 1223, 3605, 4507, 6115, 8561, 22535, 31549, 42805, 125969, 157745, 464221, 629845, 881783, 2321105, 3249547, 4408915, 5512061, 16247735, 27560305, 38584427, 192922135, 567742283, 2838711415, 3974195981, 19870979905]

約数ペア:

[(1, 19870979905), (5, 3974195981), (7, 2838711415), (35, 567742283), (103, 192922135), (515, 38584427), (721, 27560305), (1223, 16247735), (3605, 5512061), (4507, 4408915), (6115, 3249547), (8561, 2321105), (22535, 881783), (31549, 629845), (42805, 464221), (125969, 157745)]