19909805

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{41}}^1\times {\mathrm{197}}^1$

素因数の和:289

約数の個数: 32

約数和(自身を含む): 26943840

約数和(自身を除く): 7034035

約数列:

[1, 5, 17, 29, 41, 85, 145, 197, 205, 493, 697, 985, 1189, 2465, 3349, 3485, 5713, 5945, 8077, 16745, 20213, 28565, 40385, 97121, 101065, 137309, 234233, 485605, 686545, 1171165, 3981961, 19909805]

約数ペア:

[(1, 19909805), (5, 3981961), (17, 1171165), (29, 686545), (41, 485605), (85, 234233), (145, 137309), (197, 101065), (205, 97121), (493, 40385), (697, 28565), (985, 20213), (1189, 16745), (2465, 8077), (3349, 5945), (3485, 5713)]