20721540

素因数分解:

$2^2\times 3^1\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{479}}^1$

素因数の和:601

約数の個数: 96

約数和(自身を含む): 67092480

約数和(自身を除く): 46370940

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 103, 105, 140, 206, 210, 309, 412, 420, 479, 515, 618, 721, 958, 1030, 1236, 1437, 1442, 1545, 1916, 2060, 2163, 2395, 2874, 2884, 3090, 3353, 3605, 4326, 4790, 5748, 6180, 6706, 7185, 7210, 8652, 9580, 10059, 10815, 13412, 14370, 14420, 16765, 20118, 21630, 28740, 33530, 40236, 43260, 49337, 50295, 67060, 98674, 100590, 148011, 197348, 201180, 246685, 296022, 345359, 493370, 592044, 690718, 740055, 986740, 1036077, 1381436, 1480110, 1726795, 2072154, 2960220, 3453590, 4144308, 5180385, 6907180, 10360770, 20721540]

約数ペア:

[(1, 20721540), (2, 10360770), (3, 6907180), (4, 5180385), (5, 4144308), (6, 3453590), (7, 2960220), (10, 2072154), (12, 1726795), (14, 1480110), (15, 1381436), (20, 1036077), (21, 986740), (28, 740055), (30, 690718), (35, 592044), (42, 493370), (60, 345359), (70, 296022), (84, 246685), (103, 201180), (105, 197348), (140, 148011), (206, 100590), (210, 98674), (309, 67060), (412, 50295), (420, 49337), (479, 43260), (515, 40236), (618, 33530), (721, 28740), (958, 21630), (1030, 20118), (1236, 16765), (1437, 14420), (1442, 14370), (1545, 13412), (1916, 10815), (2060, 10059), (2163, 9580), (2395, 8652), (2874, 7210), (2884, 7185), (3090, 6706), (3353, 6180), (3605, 5748), (4326, 4790)]