19990025

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{157}}^1\times {\mathrm{463}}^1$

素因数の和:641

約数の個数: 24

約数和(自身を含む): 27272064

約数和(自身を除く): 7282039

約数列:

[1, 5, 11, 25, 55, 157, 275, 463, 785, 1727, 2315, 3925, 5093, 8635, 11575, 25465, 43175, 72691, 127325, 363455, 799601, 1817275, 3998005, 19990025]

約数ペア:

[(1, 19990025), (5, 3998005), (11, 1817275), (25, 799601), (55, 363455), (157, 127325), (275, 72691), (463, 43175), (785, 25465), (1727, 11575), (2315, 8635), (3925, 5093)]