20908004

素因数分解:

$2^2\times {\mathrm{13}}^2\times {\mathrm{157}}^1\times {\mathrm{197}}^1$

素因数の和:384

約数の個数: 36

約数和(自身を含む): 40074804

約数和(自身を除く): 19166800

約数列:

[1, 2, 4, 13, 26, 52, 157, 169, 197, 314, 338, 394, 628, 676, 788, 2041, 2561, 4082, 5122, 8164, 10244, 26533, 30929, 33293, 53066, 61858, 66586, 106132, 123716, 133172, 402077, 804154, 1608308, 5227001, 10454002, 20908004]

約数ペア:

[(1, 20908004), (2, 10454002), (4, 5227001), (13, 1608308), (26, 804154), (52, 402077), (157, 133172), (169, 123716), (197, 106132), (314, 66586), (338, 61858), (394, 53066), (628, 33293), (676, 30929), (788, 26533), (2041, 10244), (2561, 8164), (4082, 5122)]