21338471

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{59}}^1\times {\mathrm{61}}^1$

素因数の和:156

約数の個数: 36

約数和(自身を含む): 28201320

約数和(自身を除く): 6862849

約数列:

[1, 7, 11, 49, 59, 61, 77, 121, 413, 427, 539, 649, 671, 847, 2891, 2989, 3599, 4543, 4697, 5929, 7139, 7381, 25193, 31801, 32879, 39589, 49973, 51667, 176351, 277123, 349811, 361669, 435479, 1939861, 3048353, 21338471]

約数ペア:

[(1, 21338471), (7, 3048353), (11, 1939861), (49, 435479), (59, 361669), (61, 349811), (77, 277123), (121, 176351), (413, 51667), (427, 49973), (539, 39589), (649, 32879), (671, 31801), (847, 25193), (2891, 7381), (2989, 7139), (3599, 5929), (4543, 4697)]