80990020

素因数分解:

$2^2\times 5^1\times {\mathrm{157}}^1\times {\mathrm{25793}}^1$

素因数の和:25959

約数の個数: 24

約数和(自身を含む): 171168984

約数和(自身を除く): 90178964

約数列:

[1, 2, 4, 5, 10, 20, 157, 314, 628, 785, 1570, 3140, 25793, 51586, 103172, 128965, 257930, 515860, 4049501, 8099002, 16198004, 20247505, 40495010, 80990020]

約数ペア:

[(1, 80990020), (2, 40495010), (4, 20247505), (5, 16198004), (10, 8099002), (20, 4049501), (157, 515860), (314, 257930), (628, 128965), (785, 103172), (1570, 51586), (3140, 25793)]