17783980

素因数分解:

$2^2\times 5^1\times {\mathrm{89}}^1\times {\mathrm{97}}^1\times {\mathrm{103}}^1$

素因数の和:298

約数の個数: 48

約数和(自身を含む): 38525760

約数和(自身を除く): 20741780

約数列:

[1, 2, 4, 5, 10, 20, 89, 97, 103, 178, 194, 206, 356, 388, 412, 445, 485, 515, 890, 970, 1030, 1780, 1940, 2060, 8633, 9167, 9991, 17266, 18334, 19982, 34532, 36668, 39964, 43165, 45835, 49955, 86330, 91670, 99910, 172660, 183340, 199820, 889199, 1778398, 3556796, 4445995, 8891990, 17783980]

約数ペア:

[(1, 17783980), (2, 8891990), (4, 4445995), (5, 3556796), (10, 1778398), (20, 889199), (89, 199820), (97, 183340), (103, 172660), (178, 99910), (194, 91670), (206, 86330), (356, 49955), (388, 45835), (412, 43165), (445, 39964), (485, 36668), (515, 34532), (890, 19982), (970, 18334), (1030, 17266), (1780, 9991), (1940, 9167), (2060, 8633)]