21177261

素因数分解:

$3^3\times 7^2\times {\mathrm{16007}}^1$

素因数の和:16030

約数の個数: 24

約数和(自身を含む): 36498240

約数和(自身を除く): 15320979

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 147, 189, 441, 1323, 16007, 48021, 112049, 144063, 336147, 432189, 784343, 1008441, 2353029, 3025323, 7059087, 21177261]

約数ペア:

[(1, 21177261), (3, 7059087), (7, 3025323), (9, 2353029), (21, 1008441), (27, 784343), (49, 432189), (63, 336147), (147, 144063), (189, 112049), (441, 48021), (1323, 16007)]