21789261

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:194

約数の個数: 48

約数和(自身を含む): 35747712

約数和(自身を除く): 13958451

約数列:

[1, 3, 9, 13, 39, 43, 61, 71, 117, 129, 183, 213, 387, 549, 559, 639, 793, 923, 1677, 2379, 2623, 2769, 3053, 4331, 5031, 7137, 7869, 8307, 9159, 12993, 23607, 27477, 34099, 38979, 39689, 56303, 102297, 119067, 168909, 186233, 306891, 357201, 506727, 558699, 1676097, 2421029, 7263087, 21789261]

約数ペア:

[(1, 21789261), (3, 7263087), (9, 2421029), (13, 1676097), (39, 558699), (43, 506727), (61, 357201), (71, 306891), (117, 186233), (129, 168909), (183, 119067), (213, 102297), (387, 56303), (549, 39689), (559, 38979), (639, 34099), (793, 27477), (923, 23607), (1677, 12993), (2379, 9159), (2623, 8307), (2769, 7869), (3053, 7137), (4331, 5031)]