21690291

素因数分解:

$3^1\times 7^3\times {\mathrm{107}}^1\times {\mathrm{197}}^1$

素因数の和:328

約数の個数: 32

約数和(自身を含む): 34214400

約数和(自身を除く): 12524109

約数列:

[1, 3, 7, 21, 49, 107, 147, 197, 321, 343, 591, 749, 1029, 1379, 2247, 4137, 5243, 9653, 15729, 21079, 28959, 36701, 63237, 67571, 110103, 147553, 202713, 442659, 1032871, 3098613, 7230097, 21690291]

約数ペア:

[(1, 21690291), (3, 7230097), (7, 3098613), (21, 1032871), (49, 442659), (107, 202713), (147, 147553), (197, 110103), (321, 67571), (343, 63237), (591, 36701), (749, 28959), (1029, 21079), (1379, 15729), (2247, 9653), (4137, 5243)]