19917779

素因数分解:

$7^1\times {\mathrm{31}}^1\times {\mathrm{263}}^1\times {\mathrm{349}}^1$

素因数の和:650

約数の個数: 16

約数和(自身を含む): 23654400

約数和(自身を除く): 3736621

約数列:

[1, 7, 31, 217, 263, 349, 1841, 2443, 8153, 10819, 57071, 75733, 91787, 642509, 2845397, 19917779]

約数ペア:

[(1, 19917779), (7, 2845397), (31, 642509), (217, 91787), (263, 75733), (349, 57071), (1841, 10819), (2443, 8153)]