21981519

素因数分解:

$3^2\times 7^1\times {\mathrm{383}}^1\times {\mathrm{911}}^1$

素因数の和:1307

約数の個数: 24

約数和(自身を含む): 36421632

約数和(自身を除く): 14440113

約数列:

[1, 3, 7, 9, 21, 63, 383, 911, 1149, 2681, 2733, 3447, 6377, 8043, 8199, 19131, 24129, 57393, 348913, 1046739, 2442391, 3140217, 7327173, 21981519]

約数ペア:

[(1, 21981519), (3, 7327173), (7, 3140217), (9, 2442391), (21, 1046739), (63, 348913), (383, 57393), (911, 24129), (1149, 19131), (2681, 8199), (2733, 8043), (3447, 6377)]