18638991

素因数分解:

$3^4\times 7^1\times {\mathrm{71}}^1\times {\mathrm{463}}^1$

素因数の和:553

約数の個数: 40

約数和(自身を含む): 32338944

約数和(自身を除く): 13699953

約数列:

[1, 3, 7, 9, 21, 27, 63, 71, 81, 189, 213, 463, 497, 567, 639, 1389, 1491, 1917, 3241, 4167, 4473, 5751, 9723, 12501, 13419, 29169, 32873, 37503, 40257, 87507, 98619, 230111, 262521, 295857, 690333, 887571, 2070999, 2662713, 6212997, 18638991]

約数ペア:

[(1, 18638991), (3, 6212997), (7, 2662713), (9, 2070999), (21, 887571), (27, 690333), (63, 295857), (71, 262521), (81, 230111), (189, 98619), (213, 87507), (463, 40257), (497, 37503), (567, 32873), (639, 29169), (1389, 13419), (1491, 12501), (1917, 9723), (3241, 5751), (4167, 4473)]