20981223

素因数分解:

$3^2\times {\mathrm{47}}^1\times {\mathrm{193}}^1\times {\mathrm{257}}^1$

素因数の和:503

約数の個数: 24

約数和(自身を含む): 31232448

約数和(自身を除く): 10251225

約数列:

[1, 3, 9, 47, 141, 193, 257, 423, 579, 771, 1737, 2313, 9071, 12079, 27213, 36237, 49601, 81639, 108711, 148803, 446409, 2331247, 6993741, 20981223]

約数ペア:

[(1, 20981223), (3, 6993741), (9, 2331247), (47, 446409), (141, 148803), (193, 108711), (257, 81639), (423, 49601), (579, 36237), (771, 27213), (1737, 12079), (2313, 9071)]