20515521

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{239}}^1$

素因数の和:357

約数の個数: 32

約数和(自身を含む): 30965760

約数和(自身を除く): 10450239

約数列:

[1, 3, 13, 31, 39, 71, 93, 213, 239, 403, 717, 923, 1209, 2201, 2769, 3107, 6603, 7409, 9321, 16969, 22227, 28613, 50907, 85839, 96317, 220597, 288951, 526039, 661791, 1578117, 6838507, 20515521]

約数ペア:

[(1, 20515521), (3, 6838507), (13, 1578117), (31, 661791), (39, 526039), (71, 288951), (93, 220597), (213, 96317), (239, 85839), (403, 50907), (717, 28613), (923, 22227), (1209, 16969), (2201, 9321), (2769, 7409), (3107, 6603)]