21806813

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{397}}^1$

素因数の和:489

約数の個数: 24

約数和(自身を含む): 27223200

約数和(自身を除く): 5416387

約数列:

[1, 7, 19, 49, 59, 133, 397, 413, 931, 1121, 2779, 2891, 7543, 7847, 19453, 23423, 52801, 54929, 163961, 369607, 445037, 1147727, 3115259, 21806813]

約数ペア:

[(1, 21806813), (7, 3115259), (19, 1147727), (49, 445037), (59, 369607), (133, 163961), (397, 54929), (413, 52801), (931, 23423), (1121, 19453), (2779, 7847), (2891, 7543)]