21001955

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{97}}^1\times {\mathrm{3331}}^1$

素因数の和:3446

約数の個数: 16

約数和(自身を含む): 27429024

約数和(自身を除く): 6427069

約数列:

[1, 5, 13, 65, 97, 485, 1261, 3331, 6305, 16655, 43303, 216515, 323107, 1615535, 4200391, 21001955]

約数ペア:

[(1, 21001955), (5, 4200391), (13, 1615535), (65, 323107), (97, 216515), (485, 43303), (1261, 16655), (3331, 6305)]