20431011 has 4 divisors (see below), whose sum is σ = 27241352. Its totient is φ = 13620672.

The previous prime is 20431009. The next prime is 20431027. The reversal of 20431011 is 11013402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20431011 - 2¹ = 20431009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3405166 + ... + 3405171.

It is an arithmetic number, because the mean of its divisors is an integer number (6810338).

Almost surely, 2^20431011 is an apocalyptic number.

20431011 is a deficient number, since it is larger than the sum of its proper divisors (6810341).

20431011 is an equidigital number, since it uses as much as digits as its factorization.

20431011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810340.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 20431011 is about 4520.0675879903. The cubic root of 20431011 is about 273.3778262226.

Adding to 20431011 its reverse (11013402), we get a palindrome (31444413).

The spelling of 20431011 in words is "twenty million, four hundred thirty-one thousand, eleven".