21787983

素因数分解:

$3^2\times 7^1\times {\mathrm{71}}^1\times {\mathrm{4871}}^1$

素因数の和:4955

約数の個数: 24

約数和(自身を含む): 36481536

約数和(自身を除く): 14693553

約数列:

[1, 3, 7, 9, 21, 63, 71, 213, 497, 639, 1491, 4473, 4871, 14613, 34097, 43839, 102291, 306873, 345841, 1037523, 2420887, 3112569, 7262661, 21787983]

約数ペア:

[(1, 21787983), (3, 7262661), (7, 3112569), (9, 2420887), (21, 1037523), (63, 345841), (71, 306873), (213, 102291), (497, 43839), (639, 34097), (1491, 14613), (4473, 4871)]