20889819012 has 12 divisors (see below), whose sum is σ = 48742911056. Its totient is φ = 6963273000.

The previous prime is 20889818987. The next prime is 20889819017. The reversal of 20889819012 is 21091898802.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20889819012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20889819017) 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, 870409114 + ... + 870409137.

Almost surely, 2^20889819012 is an apocalyptic number.

It is an amenable number.

20889819012 is an abundant number, since it is smaller than the sum of its proper divisors (27853092044).

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

20889819012 is a wasteful number, since it uses less digits than its factorization.

20889819012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740818258 (or 1740818256 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The spelling of 20889819012 in words is "twenty billion, eight hundred eighty-nine million, eight hundred nineteen thousand, twelve".