21897071

素因数分解:

$7^2\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{271}}^1$

素因数の和:399

約数の個数: 24

約数和(自身を含む): 27349056

約数和(自身を除く): 5451985

約数列:

[1, 7, 17, 49, 97, 119, 271, 679, 833, 1649, 1897, 4607, 4753, 11543, 13279, 26287, 32249, 80801, 184009, 225743, 446879, 1288063, 3128153, 21897071]

約数ペア:

[(1, 21897071), (7, 3128153), (17, 1288063), (49, 446879), (97, 225743), (119, 184009), (271, 80801), (679, 32249), (833, 26287), (1649, 13279), (1897, 11543), (4607, 4753)]