21409791

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{37}}^2\times {\mathrm{401}}^1$

素因数の和:491

約数の個数: 24

約数和(自身を含む): 31674384

約数和(自身を除く): 10264593

約数列:

[1, 3, 13, 37, 39, 111, 401, 481, 1203, 1369, 1443, 4107, 5213, 14837, 15639, 17797, 44511, 53391, 192881, 548969, 578643, 1646907, 7136597, 21409791]

約数ペア:

[(1, 21409791), (3, 7136597), (13, 1646907), (37, 578643), (39, 548969), (111, 192881), (401, 53391), (481, 44511), (1203, 17797), (1369, 15639), (1443, 14837), (4107, 5213)]