21555681

素因数分解:

$3^1\times 7^1\times {\mathrm{83}}^2\times {\mathrm{149}}^1$

素因数の和:325

約数の個数: 24

約数和(自身を含む): 33470400

約数和(自身を除く): 11914719

約数列:

[1, 3, 7, 21, 83, 149, 249, 447, 581, 1043, 1743, 3129, 6889, 12367, 20667, 37101, 48223, 86569, 144669, 259707, 1026461, 3079383, 7185227, 21555681]

約数ペア:

[(1, 21555681), (3, 7185227), (7, 3079383), (21, 1026461), (83, 259707), (149, 144669), (249, 86569), (447, 48223), (581, 37101), (1043, 20667), (1743, 12367), (3129, 6889)]