21393540

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16979}}^1$

素因数の和:17001

約数の個数: 72

約数和(自身を含む): 74168640

約数和(自身を除く): 52775100

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16979, 33958, 50937, 67916, 84895, 101874, 118853, 152811, 169790, 203748, 237706, 254685, 305622, 339580, 356559, 475412, 509370, 594265, 611244, 713118, 764055, 1018740, 1069677, 1188530, 1426236, 1528110, 1782795, 2139354, 2377060, 3056220, 3565590, 4278708, 5348385, 7131180, 10696770, 21393540]

約数ペア:

[(1, 21393540), (2, 10696770), (3, 7131180), (4, 5348385), (5, 4278708), (6, 3565590), (7, 3056220), (9, 2377060), (10, 2139354), (12, 1782795), (14, 1528110), (15, 1426236), (18, 1188530), (20, 1069677), (21, 1018740), (28, 764055), (30, 713118), (35, 611244), (36, 594265), (42, 509370), (45, 475412), (60, 356559), (63, 339580), (70, 305622), (84, 254685), (90, 237706), (105, 203748), (126, 169790), (140, 152811), (180, 118853), (210, 101874), (252, 84895), (315, 67916), (420, 50937), (630, 33958), (1260, 16979)]