18820900978 has 16 divisors (see below), whose sum is σ = 31791317760. Its totient is φ = 8278988400.

The previous prime is 18820900937. The next prime is 18820900993. The reversal of 18820900978 is 87900902881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13797633 + ... + 13798996.

It is an arithmetic number, because the mean of its divisors is an integer number (1986957360).

Almost surely, 2^18820900978 is an apocalyptic number.

18820900978 is a deficient number, since it is larger than the sum of its proper divisors (12970416782).

18820900978 is a wasteful number, since it uses less digits than its factorization.

18820900978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27596673.

The product of its (nonzero) digits is 580608, while the sum is 52.

The spelling of 18820900978 in words is "eighteen billion, eight hundred twenty million, nine hundred thousand, nine hundred seventy-eight".