21920613

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{1381}}^1$

素因数の和:1445

約数の個数: 32

約数和(自身を含む): 35290752

約数和(自身を除く): 13370139

約数列:

[1, 3, 11, 13, 33, 37, 39, 111, 143, 407, 429, 481, 1221, 1381, 1443, 4143, 5291, 15191, 15873, 17953, 45573, 51097, 53859, 153291, 197483, 562067, 592449, 664261, 1686201, 1992783, 7306871, 21920613]

約数ペア:

[(1, 21920613), (3, 7306871), (11, 1992783), (13, 1686201), (33, 664261), (37, 592449), (39, 562067), (111, 197483), (143, 153291), (407, 53859), (429, 51097), (481, 45573), (1221, 17953), (1381, 15873), (1443, 15191), (4143, 5291)]