20804067 has 16 divisors (see below), whose sum is σ = 31108000. Its totient is φ = 13740192.

The previous prime is 20804059. The next prime is 20804087. The reversal of 20804067 is 76040802.

It is not a de Polignac number, because 20804067 - 2³ = 20804059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20804067.

It is not an unprimeable number, because it can be changed into a prime (20804087) 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, 592 + ... + 6477.

It is an arithmetic number, because the mean of its divisors is an integer number (1944250).

Almost surely, 2^20804067 is an apocalyptic number.

20804067 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20804067 is a deficient number, since it is larger than the sum of its proper divisors (10303933).

20804067 is a wasteful number, since it uses less digits than its factorization.

20804067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7187 (or 7181 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 20804067 is about 4561.1475529739. The cubic root of 20804067 is about 275.0316966220.

Adding to 20804067 its reverse (76040802), we get a palindrome (96844869).

The spelling of 20804067 in words is "twenty million, eight hundred four thousand, sixty-seven".