20805004 has 24 divisors (see below), whose sum is σ = 39912768. Its totient is φ = 9410640.

The previous prime is 20804983. The next prime is 20805011. The reversal of 20805004 is 40050802.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8947 + ... + 11029.

It is an arithmetic number, because the mean of its divisors is an integer number (1663032).

Almost surely, 2^20805004 is an apocalyptic number.

It is an amenable number.

20805004 is a deficient number, since it is larger than the sum of its proper divisors (19107764).

20805004 is a wasteful number, since it uses less digits than its factorization.

20805004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325 (or 2323 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 20805004 is about 4561.2502671965. The cubic root of 20805004 is about 275.0358256356.

Adding to 20805004 its reverse (40050802), we get a palindrome (60855806).

The spelling of 20805004 in words is "twenty million, eight hundred five thousand, four".