20281221

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{1867}}^1$

素因数の和:1961

約数の個数: 24

約数和(自身を含む): 31472064

約数和(自身を除く): 11190843

約数列:

[1, 3, 9, 17, 51, 71, 153, 213, 639, 1207, 1867, 3621, 5601, 10863, 16803, 31739, 95217, 132557, 285651, 397671, 1193013, 2253469, 6760407, 20281221]

約数ペア:

[(1, 20281221), (3, 6760407), (9, 2253469), (17, 1193013), (51, 397671), (71, 285651), (153, 132557), (213, 95217), (639, 31739), (1207, 16803), (1867, 10863), (3621, 5601)]