21287007

素因数分解:

$3^2\times 7^1\times {\mathrm{71}}^1\times {\mathrm{4759}}^1$

素因数の和:4843

約数の個数: 24

約数和(自身を含む): 35642880

約数和(自身を除く): 14355873

約数列:

[1, 3, 7, 9, 21, 63, 71, 213, 497, 639, 1491, 4473, 4759, 14277, 33313, 42831, 99939, 299817, 337889, 1013667, 2365223, 3041001, 7095669, 21287007]

約数ペア:

[(1, 21287007), (3, 7095669), (7, 3041001), (9, 2365223), (21, 1013667), (63, 337889), (71, 299817), (213, 99939), (497, 42831), (639, 33313), (1491, 14277), (4473, 4759)]