21051920

素因数分解:

$2^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{3331}}^1$

素因数の和:3423

約数の個数: 40

約数和(自身を含む): 49580160

約数和(自身を除く): 28528240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 79, 80, 158, 316, 395, 632, 790, 1264, 1580, 3160, 3331, 6320, 6662, 13324, 16655, 26648, 33310, 53296, 66620, 133240, 263149, 266480, 526298, 1052596, 1315745, 2105192, 2631490, 4210384, 5262980, 10525960, 21051920]

約数ペア:

[(1, 21051920), (2, 10525960), (4, 5262980), (5, 4210384), (8, 2631490), (10, 2105192), (16, 1315745), (20, 1052596), (40, 526298), (79, 266480), (80, 263149), (158, 133240), (316, 66620), (395, 53296), (632, 33310), (790, 26648), (1264, 16655), (1580, 13324), (3160, 6662), (3331, 6320)]