20628520889 has 4 divisors (see below), whose sum is σ = 20687969424. Its totient is φ = 20569072356.

The previous prime is 20628520877. The next prime is 20628520897. The reversal of 20628520889 is 98802582602.

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 20628520889 - 2²⁸ = 20360085433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20628520189) 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, 29723747 + ... + 29724440.

It is an arithmetic number, because the mean of its divisors is an integer number (5171992356).

Almost surely, 2^20628520889 is an apocalyptic number.

It is an amenable number.

20628520889 is a deficient number, since it is larger than the sum of its proper divisors (59448535).

20628520889 is an equidigital number, since it uses as much as digits as its factorization.

20628520889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59448534.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 20628520889 in words is "twenty billion, six hundred twenty-eight million, five hundred twenty thousand, eight hundred eighty-nine".