19847905

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{1663}}^1$

素因数の和:1717

約数の個数: 32

約数和(自身を含む): 30670848

約数和(自身を除く): 10822943

約数列:

[1, 5, 7, 11, 31, 35, 55, 77, 155, 217, 341, 385, 1085, 1663, 1705, 2387, 8315, 11641, 11935, 18293, 51553, 58205, 91465, 128051, 257765, 360871, 567083, 640255, 1804355, 2835415, 3969581, 19847905]

約数ペア:

[(1, 19847905), (5, 3969581), (7, 2835415), (11, 1804355), (31, 640255), (35, 567083), (55, 360871), (77, 257765), (155, 128051), (217, 91465), (341, 58205), (385, 51553), (1085, 18293), (1663, 11935), (1705, 11641), (2387, 8315)]