21038780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{103}}^1\times {\mathrm{1459}}^1$

素因数の和:1578

約数の個数: 48

約数和(自身を含む): 51018240

約数和(自身を除く): 29979460

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 103, 140, 206, 412, 515, 721, 1030, 1442, 1459, 2060, 2884, 2918, 3605, 5836, 7210, 7295, 10213, 14420, 14590, 20426, 29180, 40852, 51065, 102130, 150277, 204260, 300554, 601108, 751385, 1051939, 1502770, 2103878, 3005540, 4207756, 5259695, 10519390, 21038780]

約数ペア:

[(1, 21038780), (2, 10519390), (4, 5259695), (5, 4207756), (7, 3005540), (10, 2103878), (14, 1502770), (20, 1051939), (28, 751385), (35, 601108), (70, 300554), (103, 204260), (140, 150277), (206, 102130), (412, 51065), (515, 40852), (721, 29180), (1030, 20426), (1442, 14590), (1459, 14420), (2060, 10213), (2884, 7295), (2918, 7210), (3605, 5836)]