20431007 has 2 divisors, whose sum is σ = 20431008. Its totient is φ = 20431006.

The previous prime is 20431003. The next prime is 20431009. The reversal of 20431007 is 70013402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20431007 - 2² = 20431003 is a prime.

Together with 20431009, 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 (20431003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215503 + 10215504.

It is an arithmetic number, because the mean of its divisors is an integer number (10215504).

Almost surely, 2^20431007 is an apocalyptic number.

20431007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431007 is an equidigital number, since it uses as much as digits as its factorization.

20431007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 20431007 is about 4520.0671455190. The cubic root of 20431007 is about 273.3778083819.

Adding to 20431007 its reverse (70013402), we get a palindrome (90444409).

The spelling of 20431007 in words is "twenty million, four hundred thirty-one thousand, seven".