21136840

素因数分解:

$2^3\times 5^1\times {\mathrm{47}}^1\times {\mathrm{11243}}^1$

素因数の和:11301

約数の個数: 32

約数和(自身を含む): 48574080

約数和(自身を除く): 27437240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 47, 94, 188, 235, 376, 470, 940, 1880, 11243, 22486, 44972, 56215, 89944, 112430, 224860, 449720, 528421, 1056842, 2113684, 2642105, 4227368, 5284210, 10568420, 21136840]

約数ペア:

[(1, 21136840), (2, 10568420), (4, 5284210), (5, 4227368), (8, 2642105), (10, 2113684), (20, 1056842), (40, 528421), (47, 449720), (94, 224860), (188, 112430), (235, 89944), (376, 56215), (470, 44972), (940, 22486), (1880, 11243)]