20389642590 has 16 divisors (see below), whose sum is σ = 48935142288. Its totient is φ = 5437238016.

The previous prime is 20389642573. The next prime is 20389642591. The reversal of 20389642590 is 9524698302.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389642591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339827347 + ... + 339827406.

It is an arithmetic number, because the mean of its divisors is an integer number (3058446393).

Almost surely, 2^20389642590 is an apocalyptic number.

20389642590 is an abundant number, since it is smaller than the sum of its proper divisors (28545499698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20389642590 is a wasteful number, since it uses less digits than its factorization.

20389642590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679654763.

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 20389642590 in words is "twenty billion, three hundred eighty-nine million, six hundred forty-two thousand, five hundred ninety".