18991778

素因数分解:

$2^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{23563}}^1$

素因数の和:23609

約数の個数: 16

約数和(自身を含む): 31670016

約数和(自身を除く): 12678238

約数列:

[1, 2, 13, 26, 31, 62, 403, 806, 23563, 47126, 306319, 612638, 730453, 1460906, 9495889, 18991778]

約数ペア:

[(1, 18991778), (2, 9495889), (13, 1460906), (26, 730453), (31, 612638), (62, 306319), (403, 47126), (806, 23563)]