20857291

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{137}}^1\times {\mathrm{239}}^1$

素因数の和:403

約数の個数: 24

約数和(自身を含む): 26429760

約数和(自身を除く): 5572469

約数列:

[1, 7, 13, 49, 91, 137, 239, 637, 959, 1673, 1781, 3107, 6713, 11711, 12467, 21749, 32743, 87269, 152243, 229201, 425659, 1604407, 2979613, 20857291]

約数ペア:

[(1, 20857291), (7, 2979613), (13, 1604407), (49, 425659), (91, 229201), (137, 152243), (239, 87269), (637, 32743), (959, 21749), (1673, 12467), (1781, 11711), (3107, 6713)]