20219928 has 16 divisors (see below), whose sum is σ = 50549880. Its totient is φ = 6739968.

The previous prime is 20219911. The next prime is 20219939. The reversal of 20219928 is 82991202.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421225 + ... + 421272.

Almost surely, 2^20219928 is an apocalyptic number.

It is an amenable number.

20219928 is an abundant number, since it is smaller than the sum of its proper divisors (30329952).

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

20219928 is a wasteful number, since it uses less digits than its factorization.

20219928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842506 (or 842502 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20219928 is about 4496.6574252438. The cubic root of 20219928 is about 272.4330975113.

The spelling of 20219928 in words is "twenty million, two hundred nineteen thousand, nine hundred twenty-eight".