21388311

素因数分解:

$3^2\times 7^1\times {\mathrm{257}}^1\times {\mathrm{1321}}^1$

素因数の和:1591

約数の個数: 24

約数和(自身を含む): 35471904

約数和(自身を除く): 14083593

約数列:

[1, 3, 7, 9, 21, 63, 257, 771, 1321, 1799, 2313, 3963, 5397, 9247, 11889, 16191, 27741, 83223, 339497, 1018491, 2376479, 3055473, 7129437, 21388311]

約数ペア:

[(1, 21388311), (3, 7129437), (7, 3055473), (9, 2376479), (21, 1018491), (63, 339497), (257, 83223), (771, 27741), (1321, 16191), (1799, 11889), (2313, 9247), (3963, 5397)]