21406749

素因数分解:

$3^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{4127}}^1$

素因数の和:4169

約数の個数: 32

約数和(自身を含む): 36986880

約数和(自身を除く): 15580131

約数列:

[1, 3, 7, 13, 19, 21, 39, 57, 91, 133, 247, 273, 399, 741, 1729, 4127, 5187, 12381, 28889, 53651, 78413, 86667, 160953, 235239, 375557, 548891, 1019369, 1126671, 1646673, 3058107, 7135583, 21406749]

約数ペア:

[(1, 21406749), (3, 7135583), (7, 3058107), (13, 1646673), (19, 1126671), (21, 1019369), (39, 548891), (57, 375557), (91, 235239), (133, 160953), (247, 86667), (273, 78413), (399, 53651), (741, 28889), (1729, 12381), (4127, 5187)]