21218691

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{257}}^1$

素因数の和:375

約数の個数: 32

約数和(自身を含む): 32074560

約数和(自身を除く): 10855869

約数列:

[1, 3, 13, 29, 39, 73, 87, 219, 257, 377, 771, 949, 1131, 2117, 2847, 3341, 6351, 7453, 10023, 18761, 22359, 27521, 56283, 82563, 96889, 243893, 290667, 544069, 731679, 1632207, 7072897, 21218691]

約数ペア:

[(1, 21218691), (3, 7072897), (13, 1632207), (29, 731679), (39, 544069), (73, 290667), (87, 243893), (219, 96889), (257, 82563), (377, 56283), (771, 27521), (949, 22359), (1131, 18761), (2117, 10023), (2847, 7453), (3341, 6351)]