21231721

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{2617}}^1$

素因数の和:2704

約数の個数: 16

約数和(自身を含む): 25970560

約数和(自身を除く): 4738839

約数列:

[1, 7, 19, 61, 133, 427, 1159, 2617, 8113, 18319, 49723, 159637, 348061, 1117459, 3033103, 21231721]

約数ペア:

[(1, 21231721), (7, 3033103), (19, 1117459), (61, 348061), (133, 159637), (427, 49723), (1159, 18319), (2617, 8113)]