20816770887037 has 4 divisors (see below), whose sum is σ = 20839422434080. Its totient is φ = 20794119339996.

The previous prime is 20816770886983. The next prime is 20816770887043. The reversal of 20816770887037 is 73078807761802.

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 20816770887037 - 2²³ = 20816762498429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20816770887037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816770887637) 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, 11325772143 + ... + 11325773980.

It is an arithmetic number, because the mean of its divisors is an integer number (5209855608520).

Almost surely, 2^{20816770887037} is an apocalyptic number.

It is an amenable number.

20816770887037 is a deficient number, since it is larger than the sum of its proper divisors (22651547043).

20816770887037 is an equidigital number, since it uses as much as digits as its factorization.

20816770887037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22651547042.

The product of its (nonzero) digits is 44255232, while the sum is 64.

The spelling of 20816770887037 in words is "twenty trillion, eight hundred sixteen billion, seven hundred seventy million, eight hundred eighty-seven thousand, thirty-seven".