20431015513 has 4 divisors (see below), whose sum is σ = 20434030848. Its totient is φ = 20428000180.

The previous prime is 20431015477. The next prime is 20431015547. The reversal of 20431015513 is 31551013402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20431015513 - 2¹³ = 20431007321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20431015013) 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, 1497481 + ... + 1511062.

It is an arithmetic number, because the mean of its divisors is an integer number (5108507712).

Almost surely, 2^20431015513 is an apocalyptic number.

It is an amenable number.

20431015513 is a deficient number, since it is larger than the sum of its proper divisors (3015335).

20431015513 is an equidigital number, since it uses as much as digits as its factorization.

20431015513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015334.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 20431015513 its reverse (31551013402), we get a palindrome (51982028915).

The spelling of 20431015513 in words is "twenty billion, four hundred thirty-one million, fifteen thousand, five hundred thirteen".