19900405

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{419}}^1$

素因数の和:513

約数の個数: 32

約数和(自身を含む): 29030400

約数和(自身を除く): 9129995

約数列:

[1, 5, 7, 23, 35, 59, 115, 161, 295, 413, 419, 805, 1357, 2065, 2095, 2933, 6785, 9499, 9637, 14665, 24721, 47495, 48185, 67459, 123605, 173047, 337295, 568583, 865235, 2842915, 3980081, 19900405]

約数ペア:

[(1, 19900405), (5, 3980081), (7, 2842915), (23, 865235), (35, 568583), (59, 337295), (115, 173047), (161, 123605), (295, 67459), (413, 48185), (419, 47495), (805, 24721), (1357, 14665), (2065, 9637), (2095, 9499), (2933, 6785)]