21012875

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{193}}^1$

素因数の和:288

約数の個数: 32

約数和(自身を含む): 28811328

約数和(自身を除く): 7798453

約数列:

[1, 5, 13, 25, 65, 67, 125, 193, 325, 335, 871, 965, 1625, 1675, 2509, 4355, 4825, 8375, 12545, 12931, 21775, 24125, 62725, 64655, 108875, 168103, 313625, 323275, 840515, 1616375, 4202575, 21012875]

約数ペア:

[(1, 21012875), (5, 4202575), (13, 1616375), (25, 840515), (65, 323275), (67, 313625), (125, 168103), (193, 108875), (325, 64655), (335, 62725), (871, 24125), (965, 21775), (1625, 12931), (1675, 12545), (2509, 8375), (4355, 4825)]