18991880

素因数分解:

$2^3\times 5^1\times {\mathrm{491}}^1\times {\mathrm{967}}^1$

素因数の和:1469

約数の個数: 32

約数和(自身を含む): 42863040

約数和(自身を除く): 23871160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 491, 967, 982, 1934, 1964, 2455, 3868, 3928, 4835, 4910, 7736, 9670, 9820, 19340, 19640, 38680, 474797, 949594, 1899188, 2373985, 3798376, 4747970, 9495940, 18991880]

約数ペア:

[(1, 18991880), (2, 9495940), (4, 4747970), (5, 3798376), (8, 2373985), (10, 1899188), (20, 949594), (40, 474797), (491, 38680), (967, 19640), (982, 19340), (1934, 9820), (1964, 9670), (2455, 7736), (3868, 4910), (3928, 4835)]