1800

素因数分解:

$2^3\times 3^2\times 5^2$

素因数の和:22

約数の個数: 36

約数和(自身を含む): 6045

約数和(自身を除く): 4245

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 25, 30, 36, 40, 45, 50, 60, 72, 75, 90, 100, 120, 150, 180, 200, 225, 300, 360, 450, 600, 900, 1800]

約数ペア:

[(1, 1800), (2, 900), (3, 600), (4, 450), (5, 360), (6, 300), (8, 225), (9, 200), (10, 180), (12, 150), (15, 120), (18, 100), (20, 90), (24, 75), (25, 72), (30, 60), (36, 50), (40, 45)]