21531991

素因数分解:

${\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{67}}^1\times {\mathrm{419}}^1$

素因数の和:558

約数の個数: 16

約数和(自身を含む): 23990400

約数和(自身を除く): 2458409

約数列:

[1, 13, 59, 67, 419, 767, 871, 3953, 5447, 24721, 28073, 51389, 321373, 364949, 1656307, 21531991]

約数ペア:

[(1, 21531991), (13, 1656307), (59, 364949), (67, 321373), (419, 51389), (767, 28073), (871, 24721), (3953, 5447)]