19681221

素因数分解:

$3^1\times 7^1\times {\mathrm{383}}^1\times {\mathrm{2447}}^1$

素因数の和:2840

約数の個数: 16

約数和(自身を含む): 30081024

約数和(自身を除く): 10399803

約数列:

[1, 3, 7, 21, 383, 1149, 2447, 2681, 7341, 8043, 17129, 51387, 937201, 2811603, 6560407, 19681221]

約数ペア:

[(1, 19681221), (3, 6560407), (7, 2811603), (21, 937201), (383, 51387), (1149, 17129), (2447, 8043), (2681, 7341)]