20709804 has 24 divisors (see below), whose sum is σ = 48469680. Its totient is φ = 6882304.

The previous prime is 20709781. The next prime is 20709809. The reversal of 20709804 is 40890702.

It is not an unprimeable number, because it can be changed into a prime (20709809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1792 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (2019570).

Almost surely, 2^20709804 is an apocalyptic number.

It is an amenable number.

20709804 is an abundant number, since it is smaller than the sum of its proper divisors (27759876).

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

20709804 is a wasteful number, since it uses less digits than its factorization.

20709804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5249 (or 5247 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 20709804 is about 4550.8025665810. The cubic root of 20709804 is about 274.6156791280.

The spelling of 20709804 in words is "twenty million, seven hundred nine thousand, eight hundred four".