21680997

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{227}}^1$

素因数の和:353

約数の個数: 32

約数和(自身を含む): 32686080

約数和(自身を除く): 11005083

約数列:

[1, 3, 13, 31, 39, 79, 93, 227, 237, 403, 681, 1027, 1209, 2449, 2951, 3081, 7037, 7347, 8853, 17933, 21111, 31837, 53799, 91481, 95511, 233129, 274443, 555923, 699387, 1667769, 7226999, 21680997]

約数ペア:

[(1, 21680997), (3, 7226999), (13, 1667769), (31, 699387), (39, 555923), (79, 274443), (93, 233129), (227, 95511), (237, 91481), (403, 53799), (681, 31837), (1027, 21111), (1209, 17933), (2449, 8853), (2951, 7347), (3081, 7037)]