21988179

素因数分解:

$3^4\times {\mathrm{43}}^1\times {\mathrm{59}}^1\times {\mathrm{107}}^1$

素因数の和:221

約数の個数: 40

約数和(自身を含む): 34499520

約数和(自身を除く): 12511341

約数列:

[1, 3, 9, 27, 43, 59, 81, 107, 129, 177, 321, 387, 531, 963, 1161, 1593, 2537, 2889, 3483, 4601, 4779, 6313, 7611, 8667, 13803, 18939, 22833, 41409, 56817, 68499, 124227, 170451, 205497, 271459, 372681, 511353, 814377, 2443131, 7329393, 21988179]

約数ペア:

[(1, 21988179), (3, 7329393), (9, 2443131), (27, 814377), (43, 511353), (59, 372681), (81, 271459), (107, 205497), (129, 170451), (177, 124227), (321, 68499), (387, 56817), (531, 41409), (963, 22833), (1161, 18939), (1593, 13803), (2537, 8667), (2889, 7611), (3483, 6313), (4601, 4779)]