21971817

素因数分解:

$3^5\times 7^1\times {\mathrm{12917}}^1$

素因数の和:12939

約数の個数: 24

約数和(自身を含む): 37617216

約数和(自身を除く): 15645399

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 1701, 12917, 38751, 90419, 116253, 271257, 348759, 813771, 1046277, 2441313, 3138831, 7323939, 21971817]

約数ペア:

[(1, 21971817), (3, 7323939), (7, 3138831), (9, 2441313), (21, 1046277), (27, 813771), (63, 348759), (81, 271257), (189, 116253), (243, 90419), (567, 38751), (1701, 12917)]