20561648

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{239}}^1\times {\mathrm{283}}^1$

素因数の和:549

約数の個数: 40

約数和(自身を含む): 42259200

約数和(自身を除く): 21697552

約数列:

[1, 2, 4, 8, 16, 19, 38, 76, 152, 239, 283, 304, 478, 566, 956, 1132, 1912, 2264, 3824, 4528, 4541, 5377, 9082, 10754, 18164, 21508, 36328, 43016, 67637, 72656, 86032, 135274, 270548, 541096, 1082192, 1285103, 2570206, 5140412, 10280824, 20561648]

約数ペア:

[(1, 20561648), (2, 10280824), (4, 5140412), (8, 2570206), (16, 1285103), (19, 1082192), (38, 541096), (76, 270548), (152, 135274), (239, 86032), (283, 72656), (304, 67637), (478, 43016), (566, 36328), (956, 21508), (1132, 18164), (1912, 10754), (2264, 9082), (3824, 5377), (4528, 4541)]