21120309

素因数分解:

$3^2\times 7^1\times {\mathrm{523}}^1\times {\mathrm{641}}^1$

素因数の和:1177

約数の個数: 24

約数和(自身を含む): 34986432

約数和(自身を除く): 13866123

約数列:

[1, 3, 7, 9, 21, 63, 523, 641, 1569, 1923, 3661, 4487, 4707, 5769, 10983, 13461, 32949, 40383, 335243, 1005729, 2346701, 3017187, 7040103, 21120309]

約数ペア:

[(1, 21120309), (3, 7040103), (7, 3017187), (9, 2346701), (21, 1005729), (63, 335243), (523, 40383), (641, 32949), (1569, 13461), (1923, 10983), (3661, 5769), (4487, 4707)]