18900

素因数分解:

$2^2\times 3^3\times 5^2\times 7^1$

素因数の和:30

約数の個数: 72

約数和(自身を含む): 69440

約数和(自身を除く): 50540

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 25, 27, 28, 30, 35, 36, 42, 45, 50, 54, 60, 63, 70, 75, 84, 90, 100, 105, 108, 126, 135, 140, 150, 175, 180, 189, 210, 225, 252, 270, 300, 315, 350, 378, 420, 450, 525, 540, 630, 675, 700, 756, 900, 945, 1050, 1260, 1350, 1575, 1890, 2100, 2700, 3150, 3780, 4725, 6300, 9450, 18900]

約数ペア:

[(1, 18900), (2, 9450), (3, 6300), (4, 4725), (5, 3780), (6, 3150), (7, 2700), (9, 2100), (10, 1890), (12, 1575), (14, 1350), (15, 1260), (18, 1050), (20, 945), (21, 900), (25, 756), (27, 700), (28, 675), (30, 630), (35, 540), (36, 525), (42, 450), (45, 420), (50, 378), (54, 350), (60, 315), (63, 300), (70, 270), (75, 252), (84, 225), (90, 210), (100, 189), (105, 180), (108, 175), (126, 150), (135, 140)]