21206759

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{607}}^1$

素因数の和:675

約数の個数: 24

約数和(自身を含む): 26615808

約数和(自身を除く): 5409049

約数列:

[1, 7, 23, 31, 49, 161, 217, 607, 713, 1127, 1519, 4249, 4991, 13961, 18817, 29743, 34937, 97727, 131719, 432791, 684089, 922033, 3029537, 21206759]

約数ペア:

[(1, 21206759), (7, 3029537), (23, 922033), (31, 684089), (49, 432791), (161, 131719), (217, 97727), (607, 34937), (713, 29743), (1127, 18817), (1519, 13961), (4249, 4991)]