21891663

素因数分解:

$3^2\times {\mathrm{41}}^2\times {\mathrm{1447}}^1$

素因数の和:1535

約数の個数: 18

約数和(自身を含む): 32433752

約数和(自身を除く): 10542089

約数列:

[1, 3, 9, 41, 123, 369, 1447, 1681, 4341, 5043, 13023, 15129, 59327, 177981, 533943, 2432407, 7297221, 21891663]

約数ペア:

[(1, 21891663), (3, 7297221), (9, 2432407), (41, 533943), (123, 177981), (369, 59327), (1447, 15129), (1681, 13023), (4341, 5043)]