21990605

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{2843}}^1$

素因数の和:2885

約数の個数: 32

約数和(自身を含む): 34401024

約数和(自身を除く): 12410419

約数列:

[1, 5, 7, 13, 17, 35, 65, 85, 91, 119, 221, 455, 595, 1105, 1547, 2843, 7735, 14215, 19901, 36959, 48331, 99505, 184795, 241655, 258713, 338317, 628303, 1293565, 1691585, 3141515, 4398121, 21990605]

約数ペア:

[(1, 21990605), (5, 4398121), (7, 3141515), (13, 1691585), (17, 1293565), (35, 628303), (65, 338317), (85, 258713), (91, 241655), (119, 184795), (221, 99505), (455, 48331), (595, 36959), (1105, 19901), (1547, 14215), (2843, 7735)]