20020020989 has 4 divisors (see below), whose sum is σ = 20020465056. Its totient is φ = 20019576924.

The previous prime is 20020020967. The next prime is 20020020997. The reversal of 20020020989 is 98902002002.

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 20020020989 - 2²⁸ = 19751585533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020020919) 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, 145649 + ... + 247494.

It is an arithmetic number, because the mean of its divisors is an integer number (5005116264).

Almost surely, 2^20020020989 is an apocalyptic number.

It is an amenable number.

20020020989 is a deficient number, since it is larger than the sum of its proper divisors (444067).

20020020989 is an equidigital number, since it uses as much as digits as its factorization.

20020020989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444066.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 20020020989 in words is "twenty billion, twenty million, twenty thousand, nine hundred eighty-nine".