21913227

素因数分解:

$3^3\times 7^1\times {\mathrm{23}}^1\times {\mathrm{71}}^2$

素因数の和:181

約数の個数: 48

約数和(自身を含む): 39267840

約数和(自身を除く): 17354613

約数列:

[1, 3, 7, 9, 21, 23, 27, 63, 69, 71, 161, 189, 207, 213, 483, 497, 621, 639, 1449, 1491, 1633, 1917, 4347, 4473, 4899, 5041, 11431, 13419, 14697, 15123, 34293, 35287, 44091, 45369, 102879, 105861, 115943, 136107, 308637, 317583, 347829, 811601, 952749, 1043487, 2434803, 3130461, 7304409, 21913227]

約数ペア:

[(1, 21913227), (3, 7304409), (7, 3130461), (9, 2434803), (21, 1043487), (23, 952749), (27, 811601), (63, 347829), (69, 317583), (71, 308637), (161, 136107), (189, 115943), (207, 105861), (213, 102879), (483, 45369), (497, 44091), (621, 35287), (639, 34293), (1449, 15123), (1491, 14697), (1633, 13419), (1917, 11431), (4347, 5041), (4473, 4899)]