21099813

素因数分解:

$3^1\times 7^1\times {\mathrm{251}}^1\times {\mathrm{4003}}^1$

素因数の和:4264

約数の個数: 16

約数和(自身を含む): 32288256

約数和(自身を除く): 11188443

約数列:

[1, 3, 7, 21, 251, 753, 1757, 4003, 5271, 12009, 28021, 84063, 1004753, 3014259, 7033271, 21099813]

約数ペア:

[(1, 21099813), (3, 7033271), (7, 3014259), (21, 1004753), (251, 84063), (753, 28021), (1757, 12009), (4003, 5271)]