20781305

素因数分解:

$5^1\times {\mathrm{23}}^1\times {\mathrm{157}}^1\times {\mathrm{1151}}^1$

素因数の和:1336

約数の個数: 16

約数和(自身を含む): 26210304

約数和(自身を除く): 5428999

約数列:

[1, 5, 23, 115, 157, 785, 1151, 3611, 5755, 18055, 26473, 132365, 180707, 903535, 4156261, 20781305]

約数ペア:

[(1, 20781305), (5, 4156261), (23, 903535), (115, 180707), (157, 132365), (785, 26473), (1151, 18055), (3611, 5755)]