21406281

素因数分解:

$3^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{389}}^1$

素因数の和:505

約数の個数: 32

約数和(自身を含む): 33022080

約数和(自身を除く): 11615799

約数列:

[1, 3, 13, 17, 39, 51, 83, 221, 249, 389, 663, 1079, 1167, 1411, 3237, 4233, 5057, 6613, 15171, 18343, 19839, 32287, 55029, 85969, 96861, 257907, 419731, 548879, 1259193, 1646637, 7135427, 21406281]

約数ペア:

[(1, 21406281), (3, 7135427), (13, 1646637), (17, 1259193), (39, 548879), (51, 419731), (83, 257907), (221, 96861), (249, 85969), (389, 55029), (663, 32287), (1079, 19839), (1167, 18343), (1411, 15171), (3237, 6613), (4233, 5057)]