19915217

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{431}}^1$

素因数の和:509

約数の個数: 24

約数和(自身を含む): 24820992

約数和(自身を除く): 4905775

約数列:

[1, 7, 23, 41, 49, 161, 287, 431, 943, 1127, 2009, 3017, 6601, 9913, 17671, 21119, 46207, 69391, 123697, 406433, 485737, 865879, 2845031, 19915217]

約数ペア:

[(1, 19915217), (7, 2845031), (23, 865879), (41, 485737), (49, 406433), (161, 123697), (287, 69391), (431, 46207), (943, 21119), (1127, 17671), (2009, 9913), (3017, 6601)]