19917793

素因数分解:

$7^1\times {\mathrm{23}}^1\times {\mathrm{193}}^1\times {\mathrm{641}}^1$

素因数の和:864

約数の個数: 16

約数和(自身を含む): 23913216

約数和(自身を除く): 3995423

約数列:

[1, 7, 23, 161, 193, 641, 1351, 4439, 4487, 14743, 31073, 103201, 123713, 865991, 2845399, 19917793]

約数ペア:

[(1, 19917793), (7, 2845399), (23, 865991), (161, 123713), (193, 103201), (641, 31073), (1351, 14743), (4439, 4487)]