19981280

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{11353}}^1$

素因数の和:11379

約数の個数: 48

約数和(自身を含む): 51501744

約数和(自身を除く): 31520464

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 80, 88, 110, 160, 176, 220, 352, 440, 880, 1760, 11353, 22706, 45412, 56765, 90824, 113530, 124883, 181648, 227060, 249766, 363296, 454120, 499532, 624415, 908240, 999064, 1248830, 1816480, 1998128, 2497660, 3996256, 4995320, 9990640, 19981280]

約数ペア:

[(1, 19981280), (2, 9990640), (4, 4995320), (5, 3996256), (8, 2497660), (10, 1998128), (11, 1816480), (16, 1248830), (20, 999064), (22, 908240), (32, 624415), (40, 499532), (44, 454120), (55, 363296), (80, 249766), (88, 227060), (110, 181648), (160, 124883), (176, 113530), (220, 90824), (352, 56765), (440, 45412), (880, 22706), (1760, 11353)]