21280155

素因数分解:

$3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{61}}^1\times {\mathrm{1789}}^1$

素因数の和:1871

約数の個数: 32

約数和(自身を含む): 37289280

約数和(自身を除く): 16009125

約数列:

[1, 3, 5, 13, 15, 39, 61, 65, 183, 195, 305, 793, 915, 1789, 2379, 3965, 5367, 8945, 11895, 23257, 26835, 69771, 109129, 116285, 327387, 348855, 545645, 1418677, 1636935, 4256031, 7093385, 21280155]

約数ペア:

[(1, 21280155), (3, 7093385), (5, 4256031), (13, 1636935), (15, 1418677), (39, 545645), (61, 348855), (65, 327387), (183, 116285), (195, 109129), (305, 69771), (793, 26835), (915, 23257), (1789, 11895), (2379, 8945), (3965, 5367)]