20287990

素因数分解:

$2^1\times 5^1\times {\mathrm{61}}^1\times {\mathrm{79}}^1\times {\mathrm{421}}^1$

素因数の和:568

約数の個数: 32

約数和(自身を含む): 37676160

約数和(自身を除く): 17388170

約数列:

[1, 2, 5, 10, 61, 79, 122, 158, 305, 395, 421, 610, 790, 842, 2105, 4210, 4819, 9638, 24095, 25681, 33259, 48190, 51362, 66518, 128405, 166295, 256810, 332590, 2028799, 4057598, 10143995, 20287990]

約数ペア:

[(1, 20287990), (2, 10143995), (5, 4057598), (10, 2028799), (61, 332590), (79, 256810), (122, 166295), (158, 128405), (305, 66518), (395, 51362), (421, 48190), (610, 33259), (790, 25681), (842, 24095), (2105, 9638), (4210, 4819)]