21560

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{11}}^1$

素因数の和:36

約数の個数: 48

約数和(自身を含む): 61560

約数和(自身を除く): 40000

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 40, 44, 49, 55, 56, 70, 77, 88, 98, 110, 140, 154, 196, 220, 245, 280, 308, 385, 392, 440, 490, 539, 616, 770, 980, 1078, 1540, 1960, 2156, 2695, 3080, 4312, 5390, 10780, 21560]

約数ペア:

[(1, 21560), (2, 10780), (4, 5390), (5, 4312), (7, 3080), (8, 2695), (10, 2156), (11, 1960), (14, 1540), (20, 1078), (22, 980), (28, 770), (35, 616), (40, 539), (44, 490), (49, 440), (55, 392), (56, 385), (70, 308), (77, 280), (88, 245), (98, 220), (110, 196), (140, 154)]