20804510156 has 12 divisors (see below), whose sum is σ = 36464169168. Its totient is φ = 10386176112.

The previous prime is 20804510147. The next prime is 20804510197. The reversal of 20804510156 is 65101540802.

It is a super-2 number, since 2×20804510156² (a number of 21 digits) 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, 4016831 + ... + 4022006.

It is an arithmetic number, because the mean of its divisors is an integer number (3038680764).

Almost surely, 2^20804510156 is an apocalyptic number.

It is an amenable number.

20804510156 is a deficient number, since it is larger than the sum of its proper divisors (15659659012).

20804510156 is a wasteful number, since it uses less digits than its factorization.

20804510156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8039488 (or 8039486 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The spelling of 20804510156 in words is "twenty billion, eight hundred four million, five hundred ten thousand, one hundred fifty-six".