20991520

素因数分解:

$2^5\times 5^1\times {\mathrm{11}}^1\times {\mathrm{11927}}^1$

素因数の和:11953

約数の個数: 48

約数和(自身を含む): 54105408

約数和(自身を除く): 33113888

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, 11927, 23854, 47708, 59635, 95416, 119270, 131197, 190832, 238540, 262394, 381664, 477080, 524788, 655985, 954160, 1049576, 1311970, 1908320, 2099152, 2623940, 4198304, 5247880, 10495760, 20991520]

約数ペア:

[(1, 20991520), (2, 10495760), (4, 5247880), (5, 4198304), (8, 2623940), (10, 2099152), (11, 1908320), (16, 1311970), (20, 1049576), (22, 954160), (32, 655985), (40, 524788), (44, 477080), (55, 381664), (80, 262394), (88, 238540), (110, 190832), (160, 131197), (176, 119270), (220, 95416), (352, 59635), (440, 47708), (880, 23854), (1760, 11927)]