19990685

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{73}}^1\times {\mathrm{383}}^1$

素因数の和:485

約数の個数: 32

約数和(自身を含む): 28643328

約数和(自身を除く): 8652643

約数列:

[1, 5, 11, 13, 55, 65, 73, 143, 365, 383, 715, 803, 949, 1915, 4015, 4213, 4745, 4979, 10439, 21065, 24895, 27959, 52195, 54769, 139795, 273845, 307549, 363467, 1537745, 1817335, 3998137, 19990685]

約数ペア:

[(1, 19990685), (5, 3998137), (11, 1817335), (13, 1537745), (55, 363467), (65, 307549), (73, 273845), (143, 139795), (365, 54769), (383, 52195), (715, 27959), (803, 24895), (949, 21065), (1915, 10439), (4015, 4979), (4213, 4745)]