20919171

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{109}}^1$

素因数の和:188

約数の個数: 64

約数和(自身を含む): 37452800

約数和(自身を除く): 16533629

約数列:

[1, 3, 7, 13, 19, 21, 37, 39, 57, 91, 109, 111, 133, 247, 259, 273, 327, 399, 481, 703, 741, 763, 777, 1417, 1443, 1729, 2071, 2109, 2289, 3367, 4033, 4251, 4921, 5187, 6213, 9139, 9919, 10101, 12099, 14497, 14763, 26923, 27417, 28231, 29757, 43491, 52429, 63973, 76627, 80769, 84693, 157287, 188461, 191919, 229881, 367003, 536389, 565383, 996151, 1101009, 1609167, 2988453, 6973057, 20919171]

約数ペア:

[(1, 20919171), (3, 6973057), (7, 2988453), (13, 1609167), (19, 1101009), (21, 996151), (37, 565383), (39, 536389), (57, 367003), (91, 229881), (109, 191919), (111, 188461), (133, 157287), (247, 84693), (259, 80769), (273, 76627), (327, 63973), (399, 52429), (481, 43491), (703, 29757), (741, 28231), (763, 27417), (777, 26923), (1417, 14763), (1443, 14497), (1729, 12099), (2071, 10101), (2109, 9919), (2289, 9139), (3367, 6213), (4033, 5187), (4251, 4921)]