21087321

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{12757}}^1$

素因数の和:12808

約数の個数: 16

約数和(自身を含む): 30619200

約数和(自身を除く): 9531879

約数列:

[1, 3, 19, 29, 57, 87, 551, 1653, 12757, 38271, 242383, 369953, 727149, 1109859, 7029107, 21087321]

約数ペア:

[(1, 21087321), (3, 7029107), (19, 1109859), (29, 727149), (57, 369953), (87, 242383), (551, 38271), (1653, 12757)]