21078239

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{167}}^1$

素因数の和:279

約数の個数: 32

約数和(自身を含む): 27847680

約数和(自身を除く): 6769441

約数列:

[1, 7, 13, 19, 73, 91, 133, 167, 247, 511, 949, 1169, 1387, 1729, 2171, 3173, 6643, 9709, 12191, 15197, 18031, 22211, 41249, 85337, 126217, 158483, 231629, 288743, 1109381, 1621403, 3011177, 21078239]

約数ペア:

[(1, 21078239), (7, 3011177), (13, 1621403), (19, 1109381), (73, 288743), (91, 231629), (133, 158483), (167, 126217), (247, 85337), (511, 41249), (949, 22211), (1169, 18031), (1387, 15197), (1729, 12191), (2171, 9709), (3173, 6643)]