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20731043 is a prime number
BaseRepresentation
bin100111100010…
…1010010100011
31110000020122102
41033011102203
520301343133
62020201015
7341132234
oct117052243
943006572
1020731043
111077a5a3
126b3916b
1343ab0b8
142a7908b
151c477e8
hex13c54a3

20731043 has 2 divisors, whose sum is σ = 20731044. Its totient is φ = 20731042.

The previous prime is 20731001. The next prime is 20731049. The reversal of 20731043 is 34013702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20731043 - 26 = 20730979 is a prime.

It is a super-2 number, since 2×207310432 = 859552287735698, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20731049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365521 + 10365522.

It is an arithmetic number, because the mean of its divisors is an integer number (10365522).

Almost surely, 220731043 is an apocalyptic number.

20731043 is a deficient number, since it is larger than the sum of its proper divisors (1).

20731043 is an equidigital number, since it uses as much as digits as its factorization.

20731043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 20731043 is about 4553.1355130284. The cubic root of 20731043 is about 274.7095246915.

Adding to 20731043 its reverse (34013702), we get a palindrome (54744745).

The spelling of 20731043 in words is "twenty million, seven hundred thirty-one thousand, forty-three".