21506823

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{863}}^1$

素因数の和:956

約数の個数: 32

約数和(自身を含む): 34836480

約数和(自身を除く): 13329657

約数列:

[1, 3, 9, 13, 27, 39, 71, 117, 213, 351, 639, 863, 923, 1917, 2589, 2769, 7767, 8307, 11219, 23301, 24921, 33657, 61273, 100971, 183819, 302913, 551457, 796549, 1654371, 2389647, 7168941, 21506823]

約数ペア:

[(1, 21506823), (3, 7168941), (9, 2389647), (13, 1654371), (27, 796549), (39, 551457), (71, 302913), (117, 183819), (213, 100971), (351, 61273), (639, 33657), (863, 24921), (923, 23301), (1917, 11219), (2589, 8307), (2769, 7767)]