20789930 has 64 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 6614784.

The previous prime is 20789927. The next prime is 20790017. The reversal of 20789930 is 3998702.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59396 + ... + 59744.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^20789930 is an apocalyptic number.

20789930 is an abundant number, since it is smaller than the sum of its proper divisors (25174870).

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

20789930 is a wasteful number, since it uses less digits than its factorization.

20789930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20789930 is about 4559.5975699616. The cubic root of 20789930 is about 274.9693850216.

The spelling of 20789930 in words is "twenty million, seven hundred eighty-nine thousand, nine hundred thirty".