20889898439 has 4 divisors (see below), whose sum is σ = 20890206480. Its totient is φ = 20889590400.

The previous prime is 20889898433. The next prime is 20889898457. The reversal of 20889898439 is 93489898802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93489898802 = 2 ⋅46744949401.

It is a cyclic number.

It is not a de Polignac number, because 20889898439 - 2¹⁶ = 20889832903 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 (20889898433) 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, 2819 + ... + 204420.

It is an arithmetic number, because the mean of its divisors is an integer number (5222551620).

Almost surely, 2^20889898439 is an apocalyptic number.

20889898439 is a deficient number, since it is larger than the sum of its proper divisors (308041).

20889898439 is a wasteful number, since it uses less digits than its factorization.

20889898439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308040.

The product of its (nonzero) digits is 71663616, while the sum is 68.

The spelling of 20889898439 in words is "twenty billion, eight hundred eighty-nine million, eight hundred ninety-eight thousand, four hundred thirty-nine".