20788569

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{487}}^1$

素因数の和:547

約数の個数: 40

約数和(自身を含む): 34011648

約数和(自身を除く): 13223079

約数列:

[1, 3, 9, 17, 27, 31, 51, 81, 93, 153, 279, 459, 487, 527, 837, 1377, 1461, 1581, 2511, 4383, 4743, 8279, 13149, 14229, 15097, 24837, 39447, 42687, 45291, 74511, 135873, 223533, 256649, 407619, 670599, 769947, 1222857, 2309841, 6929523, 20788569]

約数ペア:

[(1, 20788569), (3, 6929523), (9, 2309841), (17, 1222857), (27, 769947), (31, 670599), (51, 407619), (81, 256649), (93, 223533), (153, 135873), (279, 74511), (459, 45291), (487, 42687), (527, 39447), (837, 24837), (1377, 15097), (1461, 14229), (1581, 13149), (2511, 8279), (4383, 4743)]