20690740

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{491}}^1$

素因数の和:557

約数の個数: 72

約数和(自身を含む): 51825312

約数和(自身を除く): 31134572

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 49, 70, 86, 98, 140, 172, 196, 215, 245, 301, 430, 490, 491, 602, 860, 980, 982, 1204, 1505, 1964, 2107, 2455, 3010, 3437, 4214, 4910, 6020, 6874, 8428, 9820, 10535, 13748, 17185, 21070, 21113, 24059, 34370, 42140, 42226, 48118, 68740, 84452, 96236, 105565, 120295, 147791, 211130, 240590, 295582, 422260, 481180, 591164, 738955, 1034537, 1477910, 2069074, 2955820, 4138148, 5172685, 10345370, 20690740]

約数ペア:

[(1, 20690740), (2, 10345370), (4, 5172685), (5, 4138148), (7, 2955820), (10, 2069074), (14, 1477910), (20, 1034537), (28, 738955), (35, 591164), (43, 481180), (49, 422260), (70, 295582), (86, 240590), (98, 211130), (140, 147791), (172, 120295), (196, 105565), (215, 96236), (245, 84452), (301, 68740), (430, 48118), (490, 42226), (491, 42140), (602, 34370), (860, 24059), (980, 21113), (982, 21070), (1204, 17185), (1505, 13748), (1964, 10535), (2107, 9820), (2455, 8428), (3010, 6874), (3437, 6020), (4214, 4910)]