20431045 has 8 divisors (see below), whose sum is σ = 24542496. Its totient is φ = 16328016.

The previous prime is 20431043. The next prime is 20431057. The reversal of 20431045 is 54013402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20431045 - 2¹ = 20431043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6274 + ... + 8956.

It is an arithmetic number, because the mean of its divisors is an integer number (3067812).

Almost surely, 2^20431045 is an apocalyptic number.

It is an amenable number.

20431045 is a deficient number, since it is larger than the sum of its proper divisors (4111451).

20431045 is a wasteful number, since it uses less digits than its factorization.

20431045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20431045 is about 4520.0713489944. The cubic root of 20431045 is about 273.3779778686.

Adding to 20431045 its reverse (54013402), we get a palindrome (74444447).

The spelling of 20431045 in words is "twenty million, four hundred thirty-one thousand, forty-five".