20804536 has 8 divisors (see below), whose sum is σ = 39008520. Its totient is φ = 10402264.

The previous prime is 20804533. The next prime is 20804573. The reversal of 20804536 is 63540802.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20804533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300276 + ... + 1300291.

It is an arithmetic number, because the mean of its divisors is an integer number (4876065).

Almost surely, 2^20804536 is an apocalyptic number.

It is an amenable number.

20804536 is a deficient number, since it is larger than the sum of its proper divisors (18203984).

20804536 is a wasteful number, since it uses less digits than its factorization.

20804536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600573 (or 2600569 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20804536 is about 4561.1989651845. The cubic root of 20804536 is about 275.0337633476.

The spelling of 20804536 in words is "twenty million, eight hundred four thousand, five hundred thirty-six".