21016528

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{1279}}^1$

素因数の和:1379

約数の個数: 40

約数和(自身を含む): 44441600

約数和(自身を除く): 23425072

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 79, 104, 158, 208, 316, 632, 1027, 1264, 1279, 2054, 2558, 4108, 5116, 8216, 10232, 16432, 16627, 20464, 33254, 66508, 101041, 133016, 202082, 266032, 404164, 808328, 1313533, 1616656, 2627066, 5254132, 10508264, 21016528]

約数ペア:

[(1, 21016528), (2, 10508264), (4, 5254132), (8, 2627066), (13, 1616656), (16, 1313533), (26, 808328), (52, 404164), (79, 266032), (104, 202082), (158, 133016), (208, 101041), (316, 66508), (632, 33254), (1027, 20464), (1264, 16627), (1279, 16432), (2054, 10232), (2558, 8216), (4108, 5116)]