20168755990 has 16 divisors (see below), whose sum is σ = 36307646352. Its totient is φ = 8066638944.

The previous prime is 20168755979. The next prime is 20168756009. The reversal of 20168755990 is 9955786102.

It is a congruent 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, 5169 + ... + 200908.

It is an arithmetic number, because the mean of its divisors is an integer number (2269227897).

Almost surely, 2^20168755990 is an apocalyptic number.

20168755990 is a deficient number, since it is larger than the sum of its proper divisors (16138890362).

20168755990 is a wasteful number, since it uses less digits than its factorization.

20168755990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215871.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 20168755990 in words is "twenty billion, one hundred sixty-eight million, seven hundred fifty-five thousand, nine hundred ninety".