18819940

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1\times {\mathrm{109}}^1$

素因数の和:304

約数の個数: 48

約数和(自身を含む): 40748400

約数和(自身を除く): 21928460

約数列:

[1, 2, 4, 5, 10, 20, 89, 97, 109, 178, 194, 218, 356, 388, 436, 445, 485, 545, 890, 970, 1090, 1780, 1940, 2180, 8633, 9701, 10573, 17266, 19402, 21146, 34532, 38804, 42292, 43165, 48505, 52865, 86330, 97010, 105730, 172660, 194020, 211460, 940997, 1881994, 3763988, 4704985, 9409970, 18819940]

約数ペア:

[(1, 18819940), (2, 9409970), (4, 4704985), (5, 3763988), (10, 1881994), (20, 940997), (89, 211460), (97, 194020), (109, 172660), (178, 105730), (194, 97010), (218, 86330), (356, 52865), (388, 48505), (436, 43165), (445, 42292), (485, 38804), (545, 34532), (890, 21146), (970, 19402), (1090, 17266), (1780, 10573), (1940, 9701), (2180, 8633)]