20840804 has 12 divisors (see below), whose sum is σ = 37648128. Its totient is φ = 10084200.

The previous prime is 20840789. The next prime is 20840837. The reversal of 20840804 is 40804802.

It is a super-2 number, since 2×20840804² = 868678222732832, which contains 22 as substring.

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, 83912 + ... + 84159.

It is an arithmetic number, because the mean of its divisors is an integer number (3137344).

Almost surely, 2^20840804 is an apocalyptic number.

It is an amenable number.

20840804 is a deficient number, since it is larger than the sum of its proper divisors (16807324).

20840804 is a wasteful number, since it uses less digits than its factorization.

20840804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168106 (or 168104 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20840804 is about 4565.1729430548. The cubic root of 20840804 is about 275.1934902744.

The spelling of 20840804 in words is "twenty million, eight hundred forty thousand, eight hundred four".