21201388

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{79}}^1\times {\mathrm{397}}^1$

素因数の和:506

約数の個数: 36

約数和(自身を含む): 40787040

約数和(自身を除く): 19585652

約数列:

[1, 2, 4, 13, 26, 52, 79, 158, 169, 316, 338, 397, 676, 794, 1027, 1588, 2054, 4108, 5161, 10322, 13351, 20644, 26702, 31363, 53404, 62726, 67093, 125452, 134186, 268372, 407719, 815438, 1630876, 5300347, 10600694, 21201388]

約数ペア:

[(1, 21201388), (2, 10600694), (4, 5300347), (13, 1630876), (26, 815438), (52, 407719), (79, 268372), (158, 134186), (169, 125452), (316, 67093), (338, 62726), (397, 53404), (676, 31363), (794, 26702), (1027, 20644), (1588, 13351), (2054, 10322), (4108, 5161)]