18991940

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{173}}^1\times {\mathrm{499}}^1$

素因数の和:692

約数の個数: 48

約数和(自身を含む): 43848000

約数和(自身を除く): 24856060

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 173, 220, 346, 499, 692, 865, 998, 1730, 1903, 1996, 2495, 3460, 3806, 4990, 5489, 7612, 9515, 9980, 10978, 19030, 21956, 27445, 38060, 54890, 86327, 109780, 172654, 345308, 431635, 863270, 949597, 1726540, 1899194, 3798388, 4747985, 9495970, 18991940]

約数ペア:

[(1, 18991940), (2, 9495970), (4, 4747985), (5, 3798388), (10, 1899194), (11, 1726540), (20, 949597), (22, 863270), (44, 431635), (55, 345308), (110, 172654), (173, 109780), (220, 86327), (346, 54890), (499, 38060), (692, 27445), (865, 21956), (998, 19030), (1730, 10978), (1903, 9980), (1996, 9515), (2495, 7612), (3460, 5489), (3806, 4990)]