20437540579 has 4 divisors (see below), whose sum is σ = 20438998776. Its totient is φ = 20436082384.

The previous prime is 20437540561. The next prime is 20437540603. The reversal of 20437540579 is 97504573402.

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

It is a cyclic number.

It is not a de Polignac number, because 20437540579 - 2²⁵ = 20403986147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20437540549) 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, 707869 + ... + 736174.

It is an arithmetic number, because the mean of its divisors is an integer number (5109749694).

Almost surely, 2^20437540579 is an apocalyptic number.

20437540579 is a deficient number, since it is larger than the sum of its proper divisors (1458197).

20437540579 is a wasteful number, since it uses less digits than its factorization.

20437540579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458196.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 20437540579 in words is "twenty billion, four hundred thirty-seven million, five hundred forty thousand, five hundred seventy-nine".