21213309

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1\times {\mathrm{163}}^1$

素因数の和:297

約数の個数: 32

約数和(自身を含む): 31739904

約数和(自身を除く): 10526595

約数列:

[1, 3, 13, 39, 47, 71, 141, 163, 213, 489, 611, 923, 1833, 2119, 2769, 3337, 6357, 7661, 10011, 11573, 22983, 34719, 43381, 99593, 130143, 150449, 298779, 451347, 543931, 1631793, 7071103, 21213309]

約数ペア:

[(1, 21213309), (3, 7071103), (13, 1631793), (39, 543931), (47, 451347), (71, 298779), (141, 150449), (163, 130143), (213, 99593), (489, 43381), (611, 34719), (923, 22983), (1833, 11573), (2119, 10011), (2769, 7661), (3337, 6357)]