20168866854 has 12 divisors (see below), whose sum is σ = 43699211556. Its totient is φ = 6722955612.

The previous prime is 20168866849. The next prime is 20168866867. The reversal of 20168866854 is 45866886102.

It is a self number, because there is not a number n which added to its sum of digits gives 20168866854.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560246284 + ... + 560246319.

It is an arithmetic number, because the mean of its divisors is an integer number (3641600963).

Almost surely, 2^20168866854 is an apocalyptic number.

20168866854 is an abundant number, since it is smaller than the sum of its proper divisors (23530344702).

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

20168866854 is a wasteful number, since it uses less digits than its factorization.

20168866854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120492611 (or 1120492608 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 20168866854 in words is "twenty billion, one hundred sixty-eight million, eight hundred sixty-six thousand, eight hundred fifty-four".