21161231

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{12239}}^1$

素因数の和:12278

約数の個数: 16

約数和(自身を含む): 27417600

約数和(自身を除く): 6256369

約数列:

[1, 7, 13, 19, 91, 133, 247, 1729, 12239, 85673, 159107, 232541, 1113749, 1627787, 3023033, 21161231]

約数ペア:

[(1, 21161231), (7, 3023033), (13, 1627787), (19, 1113749), (91, 232541), (133, 159107), (247, 85673), (1729, 12239)]