20915993

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{67}}^1\times {\mathrm{277}}^1$

素因数の和:381

約数の個数: 24

約数和(自身を含む): 25860672

約数和(自身を除く): 4944679

約数列:

[1, 7, 23, 49, 67, 161, 277, 469, 1127, 1541, 1939, 3283, 6371, 10787, 13573, 18559, 44597, 75509, 129913, 312179, 426857, 909391, 2987999, 20915993]

約数ペア:

[(1, 20915993), (7, 2987999), (23, 909391), (49, 426857), (67, 312179), (161, 129913), (277, 75509), (469, 44597), (1127, 18559), (1541, 13573), (1939, 10787), (3283, 6371)]