20437900812539 has 4 divisors (see below), whose sum is σ = 23357600928624. Its totient is φ = 17518200696456.

The previous prime is 20437900812521. The next prime is 20437900812541. The reversal of 20437900812539 is 93521800973402.

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 20437900812539 - 2³⁶ = 20369181335803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20437900812559) 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, 1459850058032 + ... + 1459850058045.

It is an arithmetic number, because the mean of its divisors is an integer number (5839400232156).

Almost surely, 2^{20437900812539} is an apocalyptic number.

20437900812539 is a deficient number, since it is larger than the sum of its proper divisors (2919700116085).

20437900812539 is an equidigital number, since it uses as much as digits as its factorization.

20437900812539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919700116084.

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 20437900812539 in words is "twenty trillion, four hundred thirty-seven billion, nine hundred million, eight hundred twelve thousand, five hundred thirty-nine".