21398839

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{37}}^2$

素因数の和:128

約数の個数: 36

約数和(自身を含む): 28871640

約数和(自身を除く): 7472801

約数列:

[1, 7, 11, 29, 37, 49, 77, 203, 259, 319, 407, 539, 1073, 1369, 1421, 1813, 2233, 2849, 7511, 9583, 11803, 15059, 15631, 19943, 39701, 52577, 67081, 82621, 105413, 277907, 436711, 578347, 737891, 1945349, 3056977, 21398839]

約数ペア:

[(1, 21398839), (7, 3056977), (11, 1945349), (29, 737891), (37, 578347), (49, 436711), (77, 277907), (203, 105413), (259, 82621), (319, 67081), (407, 52577), (539, 39701), (1073, 19943), (1369, 15631), (1421, 15059), (1813, 11803), (2233, 9583), (2849, 7511)]