690640

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1$

素因数の和:199

約数の個数: 40

約数和(自身を含む): 1640520

約数和(自身を除く): 949880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 97, 178, 194, 356, 388, 445, 485, 712, 776, 890, 970, 1424, 1552, 1780, 1940, 3560, 3880, 7120, 7760, 8633, 17266, 34532, 43165, 69064, 86330, 138128, 172660, 345320, 690640]

約数ペア:

[(1, 690640), (2, 345320), (4, 172660), (5, 138128), (8, 86330), (10, 69064), (16, 43165), (20, 34532), (40, 17266), (80, 8633), (89, 7760), (97, 7120), (178, 3880), (194, 3560), (356, 1940), (388, 1780), (445, 1552), (485, 1424), (712, 970), (776, 890)]