21340340

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{313}}^1\times {\mathrm{487}}^1$

素因数の和:816

約数の個数: 48

約数和(自身を含む): 51485952

約数和(自身を除く): 30145612

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 313, 487, 626, 974, 1252, 1565, 1948, 2191, 2435, 3130, 3409, 4382, 4870, 6260, 6818, 8764, 9740, 10955, 13636, 17045, 21910, 34090, 43820, 68180, 152431, 304862, 609724, 762155, 1067017, 1524310, 2134034, 3048620, 4268068, 5335085, 10670170, 21340340]

約数ペア:

[(1, 21340340), (2, 10670170), (4, 5335085), (5, 4268068), (7, 3048620), (10, 2134034), (14, 1524310), (20, 1067017), (28, 762155), (35, 609724), (70, 304862), (140, 152431), (313, 68180), (487, 43820), (626, 34090), (974, 21910), (1252, 17045), (1565, 13636), (1948, 10955), (2191, 9740), (2435, 8764), (3130, 6818), (3409, 6260), (4382, 4870)]