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20050031 is a prime number
BaseRepresentation
bin100110001111…
…1000001101111
31101201122110202
41030133001233
520113100111
61553424115
7332264621
oct114370157
941648422
1020050031
1110354981
12686b03b
134200131
14293cc11
151b60b3b
hex131f06f

20050031 has 2 divisors, whose sum is σ = 20050032. Its totient is φ = 20050030.

The previous prime is 20050027. The next prime is 20050033. The reversal of 20050031 is 13005002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20050031 - 22 = 20050027 is a prime.

It is a super-2 number, since 2×200500312 = 804007486201922, which contains 22 as substring.

Together with 20050033, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20049994 and 20050021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20050033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10025015 + 10025016.

It is an arithmetic number, because the mean of its divisors is an integer number (10025016).

Almost surely, 220050031 is an apocalyptic number.

20050031 is the 2003-rd centered decagonal number.

20050031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20050031 is an equidigital number, since it uses as much as digits as its factorization.

20050031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 20050031 is about 4477.7260970274. The cubic root of 20050031 is about 271.6679148993.

Adding to 20050031 its reverse (13005002), we get a palindrome (33055033).

The spelling of 20050031 in words is "twenty million, fifty thousand, thirty-one".