21131721

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{109}}^1\times {\mathrm{1657}}^1$

素因数の和:1785

約数の個数: 24

約数和(自身を含む): 33193160

約数和(自身を除く): 12061439

約数列:

[1, 3, 9, 13, 39, 109, 117, 327, 981, 1417, 1657, 4251, 4971, 12753, 14913, 21541, 64623, 180613, 193869, 541839, 1625517, 2347969, 7043907, 21131721]

約数ペア:

[(1, 21131721), (3, 7043907), (9, 2347969), (13, 1625517), (39, 541839), (109, 193869), (117, 180613), (327, 64623), (981, 21541), (1417, 14913), (1657, 12753), (4251, 4971)]