21277647

素因数分解:

$3^4\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{149}}^1$

素因数の和:245

約数の個数: 40

約数和(自身を含む): 33541200

約数和(自身を除く): 12263553

約数列:

[1, 3, 9, 27, 41, 43, 81, 123, 129, 149, 369, 387, 447, 1107, 1161, 1341, 1763, 3321, 3483, 4023, 5289, 6109, 6407, 12069, 15867, 18327, 19221, 47601, 54981, 57663, 142803, 164943, 172989, 262687, 494829, 518967, 788061, 2364183, 7092549, 21277647]

約数ペア:

[(1, 21277647), (3, 7092549), (9, 2364183), (27, 788061), (41, 518967), (43, 494829), (81, 262687), (123, 172989), (129, 164943), (149, 142803), (369, 57663), (387, 54981), (447, 47601), (1107, 19221), (1161, 18327), (1341, 15867), (1763, 12069), (3321, 6407), (3483, 6109), (4023, 5289)]