20985788994 has 32 divisors (see below), whose sum is σ = 42216436224. Its totient is φ = 6954501120.

The previous prime is 20985788939. The next prime is 20985789023. The reversal of 20985788994 is 49988758902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2106064 + ... + 2116004.

It is an arithmetic number, because the mean of its divisors is an integer number (1319263632).

Almost surely, 2^20985788994 is an apocalyptic number.

20985788994 is an abundant number, since it is smaller than the sum of its proper divisors (21230647230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20985788994 is a wasteful number, since it uses less digits than its factorization.

20985788994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11962.

The product of its (nonzero) digits is 104509440, while the sum is 69.

The spelling of 20985788994 in words is "twenty billion, nine hundred eighty-five million, seven hundred eighty-eight thousand, nine hundred ninety-four".