81375280

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20759}}^1$

素因数の和:20786

約数の個数: 60

約数和(自身を含む): 220097520

約数和(自身を除く): 138722240

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20759, 41518, 83036, 103795, 145313, 166072, 207590, 290626, 332144, 415180, 581252, 726565, 830360, 1017191, 1162504, 1453130, 1660720, 2034382, 2325008, 2906260, 4068764, 5085955, 5812520, 8137528, 10171910, 11625040, 16275056, 20343820, 40687640, 81375280]

約数ペア:

[(1, 81375280), (2, 40687640), (4, 20343820), (5, 16275056), (7, 11625040), (8, 10171910), (10, 8137528), (14, 5812520), (16, 5085955), (20, 4068764), (28, 2906260), (35, 2325008), (40, 2034382), (49, 1660720), (56, 1453130), (70, 1162504), (80, 1017191), (98, 830360), (112, 726565), (140, 581252), (196, 415180), (245, 332144), (280, 290626), (392, 207590), (490, 166072), (560, 145313), (784, 103795), (980, 83036), (1960, 41518), (3920, 20759)]