21256625

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{103}}^1\times {\mathrm{127}}^1$

素因数の和:258

約数の個数: 32

約数和(自身を含む): 29073408

約数和(自身を除く): 7816783

約数列:

[1, 5, 13, 25, 65, 103, 125, 127, 325, 515, 635, 1339, 1625, 1651, 2575, 3175, 6695, 8255, 12875, 13081, 15875, 33475, 41275, 65405, 167375, 170053, 206375, 327025, 850265, 1635125, 4251325, 21256625]

約数ペア:

[(1, 21256625), (5, 4251325), (13, 1635125), (25, 850265), (65, 327025), (103, 206375), (125, 170053), (127, 167375), (325, 65405), (515, 41275), (635, 33475), (1339, 15875), (1625, 13081), (1651, 12875), (2575, 8255), (3175, 6695)]