20991540

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{89}}^1\times {\mathrm{3931}}^1$

素因数の和:4032

約数の個数: 48

約数和(自身を含む): 59451840

約数和(自身を除く): 38460300

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 89, 178, 267, 356, 445, 534, 890, 1068, 1335, 1780, 2670, 3931, 5340, 7862, 11793, 15724, 19655, 23586, 39310, 47172, 58965, 78620, 117930, 235860, 349859, 699718, 1049577, 1399436, 1749295, 2099154, 3498590, 4198308, 5247885, 6997180, 10495770, 20991540]

約数ペア:

[(1, 20991540), (2, 10495770), (3, 6997180), (4, 5247885), (5, 4198308), (6, 3498590), (10, 2099154), (12, 1749295), (15, 1399436), (20, 1049577), (30, 699718), (60, 349859), (89, 235860), (178, 117930), (267, 78620), (356, 58965), (445, 47172), (534, 39310), (890, 23586), (1068, 19655), (1335, 15724), (1780, 11793), (2670, 7862), (3931, 5340)]