19947915

素因数分解:

$3^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:141

約数の個数: 72

約数和(自身を含む): 38939472

約数和(自身を除く): 18991557

約数列:

[1, 3, 5, 9, 13, 15, 39, 43, 45, 61, 65, 117, 129, 169, 183, 195, 215, 305, 387, 507, 549, 559, 585, 645, 793, 845, 915, 1521, 1677, 1935, 2379, 2535, 2623, 2745, 2795, 3965, 5031, 7137, 7267, 7605, 7869, 8385, 10309, 11895, 13115, 21801, 23607, 25155, 30927, 34099, 35685, 36335, 39345, 51545, 65403, 92781, 102297, 109005, 118035, 154635, 170495, 306891, 327015, 443287, 463905, 511485, 1329861, 1534455, 2216435, 3989583, 6649305, 19947915]

約数ペア:

[(1, 19947915), (3, 6649305), (5, 3989583), (9, 2216435), (13, 1534455), (15, 1329861), (39, 511485), (43, 463905), (45, 443287), (61, 327015), (65, 306891), (117, 170495), (129, 154635), (169, 118035), (183, 109005), (195, 102297), (215, 92781), (305, 65403), (387, 51545), (507, 39345), (549, 36335), (559, 35685), (585, 34099), (645, 30927), (793, 25155), (845, 23607), (915, 21801), (1521, 13115), (1677, 11895), (1935, 10309), (2379, 8385), (2535, 7869), (2623, 7605), (2745, 7267), (2795, 7137), (3965, 5031)]