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20312111 is a prime number
BaseRepresentation
bin100110101111…
…1000000101111
31102012221222102
41031133000233
520144441421
62003205315
7334435661
oct115370057
942187872
1020312111
1110513876
12697683b
134292501
1429aa531
151bb360b
hex135f02f

20312111 has 2 divisors, whose sum is σ = 20312112. Its totient is φ = 20312110.

The previous prime is 20312077. The next prime is 20312113. The reversal of 20312111 is 11121302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20312111 - 210 = 20311087 is a prime.

Together with 20312113, 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 = 20312092 and 20312101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156055 + 10156056.

It is an arithmetic number, because the mean of its divisors is an integer number (10156056).

Almost surely, 220312111 is an apocalyptic number.

20312111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312111 is an equidigital number, since it uses as much as digits as its factorization.

20312111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 20312111 is about 4506.8959384481. The cubic root of 20312111 is about 272.8464790031.

Adding to 20312111 its reverse (11121302), we get a palindrome (31433413).

The spelling of 20312111 in words is "twenty million, three hundred twelve thousand, one hundred eleven".