20610431 has 2 divisors, whose sum is σ = 20610432. Its totient is φ = 20610430.

The previous prime is 20610427. The next prime is 20610433. The reversal of 20610431 is 13401602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20610431 - 2² = 20610427 is a prime.

It is a super-2 number, since 2×20610431² = 849579732011522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 20610433, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20610433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10305215 + 10305216.

It is an arithmetic number, because the mean of its divisors is an integer number (10305216).

Almost surely, 2^20610431 is an apocalyptic number.

20610431 is a deficient number, since it is larger than the sum of its proper divisors (1).

20610431 is an equidigital number, since it uses as much as digits as its factorization.

20610431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20610431 is about 4539.8712536811. The cubic root of 20610431 is about 274.1757401718.

The spelling of 20610431 in words is "twenty million, six hundred ten thousand, four hundred thirty-one".