257788257

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{151}}^1\times {\mathrm{491}}^1$

素因数の和:725

約数の個数: 32

約数和(自身を含む): 370928640

約数和(自身を除く): 113140383

約数列:

[1, 3, 19, 57, 61, 151, 183, 453, 491, 1159, 1473, 2869, 3477, 8607, 9211, 9329, 27633, 27987, 29951, 74141, 89853, 175009, 222423, 525027, 569069, 1408679, 1707207, 4226037, 4522601, 13567803, 85929419, 257788257]

約数ペア:

[(1, 257788257), (3, 85929419), (19, 13567803), (57, 4522601), (61, 4226037), (151, 1707207), (183, 1408679), (453, 569069), (491, 525027), (1159, 222423), (1473, 175009), (2869, 89853), (3477, 74141), (8607, 29951), (9211, 27987), (9329, 27633)]