21071519

素因数分解:

$7^3\times {\mathrm{23}}^1\times {\mathrm{2671}}^1$

素因数の和:2715

約数の個数: 16

約数和(自身を含む): 25651200

約数和(自身を除く): 4579681

約数列:

[1, 7, 23, 49, 161, 343, 1127, 2671, 7889, 18697, 61433, 130879, 430031, 916153, 3010217, 21071519]

約数ペア:

[(1, 21071519), (7, 3010217), (23, 916153), (49, 430031), (161, 130879), (343, 61433), (1127, 18697), (2671, 7889)]