21490209

素因数分解:

$3^2\times {\mathrm{13}}^2\times {\mathrm{71}}^1\times {\mathrm{199}}^1$

素因数の和:302

約数の個数: 36

約数和(自身を含む): 34257600

約数和(自身を除く): 12767391

約数列:

[1, 3, 9, 13, 39, 71, 117, 169, 199, 213, 507, 597, 639, 923, 1521, 1791, 2587, 2769, 7761, 8307, 11999, 14129, 23283, 33631, 35997, 42387, 100893, 107991, 127161, 183677, 302679, 551031, 1653093, 2387801, 7163403, 21490209]

約数ペア:

[(1, 21490209), (3, 7163403), (9, 2387801), (13, 1653093), (39, 551031), (71, 302679), (117, 183677), (169, 127161), (199, 107991), (213, 100893), (507, 42387), (597, 35997), (639, 33631), (923, 23283), (1521, 14129), (1791, 11999), (2587, 8307), (2769, 7761)]