20819012928 has 56 divisors (see below), whose sum is σ = 62952733632. Its totient is φ = 5948289024.

The previous prime is 20819012909. The next prime is 20819012933. The reversal of 20819012928 is 82921091802.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×20819012928² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20819012928.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7743825 + ... + 7746512.

Almost surely, 2^20819012928 is an apocalyptic number.

20819012928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20819012928 is an abundant number, since it is smaller than the sum of its proper divisors (42133720704).

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

20819012928 is a wasteful number, since it uses less digits than its factorization.

20819012928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15490359 (or 15490349 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 20819012928 in words is "twenty billion, eight hundred nineteen million, twelve thousand, nine hundred twenty-eight".