20902581

素因数分解:

$3^2\times 7^1\times {\mathrm{257}}^1\times {\mathrm{1291}}^1$

素因数の和:1561

約数の個数: 24

約数和(自身を含む): 34666944

約数和(自身を除く): 13764363

約数列:

[1, 3, 7, 9, 21, 63, 257, 771, 1291, 1799, 2313, 3873, 5397, 9037, 11619, 16191, 27111, 81333, 331787, 995361, 2322509, 2986083, 6967527, 20902581]

約数ペア:

[(1, 20902581), (3, 6967527), (7, 2986083), (9, 2322509), (21, 995361), (63, 331787), (257, 81333), (771, 27111), (1291, 16191), (1799, 11619), (2313, 9037), (3873, 5397)]