21553777

素因数分解:

$7^4\times {\mathrm{47}}^1\times {\mathrm{191}}^1$

素因数の和:266

約数の個数: 20

約数和(自身を含む): 25814016

約数和(自身を除く): 4260239

約数列:

[1, 7, 47, 49, 191, 329, 343, 1337, 2303, 2401, 8977, 9359, 16121, 62839, 65513, 112847, 439873, 458591, 3079111, 21553777]

約数ペア:

[(1, 21553777), (7, 3079111), (47, 458591), (49, 439873), (191, 112847), (329, 65513), (343, 62839), (1337, 16121), (2303, 9359), (2401, 8977)]