20856321

素因数分解:

$3^2\times {\mathrm{71}}^1\times {\mathrm{127}}^1\times {\mathrm{257}}^1$

素因数の和:461

約数の個数: 24

約数和(自身を含む): 30910464

約数和(自身を除く): 10054143

約数列:

[1, 3, 9, 71, 127, 213, 257, 381, 639, 771, 1143, 2313, 9017, 18247, 27051, 32639, 54741, 81153, 97917, 164223, 293751, 2317369, 6952107, 20856321]

約数ペア:

[(1, 20856321), (3, 6952107), (9, 2317369), (71, 293751), (127, 164223), (213, 97917), (257, 81153), (381, 54741), (639, 32639), (771, 27051), (1143, 18247), (2313, 9017)]