20561440

素因数分解:

$2^5\times 5^1\times {\mathrm{128509}}^1$

素因数の和:128524

約数の個数: 24

約数和(自身を含む): 48576780

約数和(自身を除く): 28015340

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 128509, 257018, 514036, 642545, 1028072, 1285090, 2056144, 2570180, 4112288, 5140360, 10280720, 20561440]

約数ペア:

[(1, 20561440), (2, 10280720), (4, 5140360), (5, 4112288), (8, 2570180), (10, 2056144), (16, 1285090), (20, 1028072), (32, 642545), (40, 514036), (80, 257018), (160, 128509)]