20804937 has 16 divisors (see below), whose sum is σ = 28761600. Its totient is φ = 13363200.

The previous prime is 20804933. The next prime is 20804947. The reversal of 20804937 is 73940802.

It is not a de Polignac number, because 20804937 - 2² = 20804933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20804898 and 20804907.

It is not an unprimeable number, because it can be changed into a prime (20804933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32137 + ... + 32777.

It is an arithmetic number, because the mean of its divisors is an integer number (1797600).

Almost surely, 2^20804937 is an apocalyptic number.

It is an amenable number.

20804937 is a deficient number, since it is larger than the sum of its proper divisors (7956663).

20804937 is a wasteful number, since it uses less digits than its factorization.

20804937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20804937 is about 4561.2429227131. The cubic root of 20804937 is about 275.0355303955.

The spelling of 20804937 in words is "twenty million, eight hundred four thousand, nine hundred thirty-seven".