21272713

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{61}}^1\times {\mathrm{647}}^1$

素因数の和:733

約数の個数: 24

約数和(自身を含む): 27480384

約数和(自身を除く): 6207671

約数列:

[1, 7, 11, 49, 61, 77, 427, 539, 647, 671, 2989, 4529, 4697, 7117, 31703, 32879, 39467, 49819, 276269, 348733, 434137, 1933883, 3038959, 21272713]

約数ペア:

[(1, 21272713), (7, 3038959), (11, 1933883), (49, 434137), (61, 348733), (77, 276269), (427, 49819), (539, 39467), (647, 32879), (671, 31703), (2989, 7117), (4529, 4697)]