20856516454 has 8 divisors (see below), whose sum is σ = 31395322440. Its totient is φ = 10391408976.

The previous prime is 20856516451. The next prime is 20856516469. The reversal of 20856516454 is 45461565802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856516451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18423919 + ... + 18425050.

It is an arithmetic number, because the mean of its divisors is an integer number (3924415305).

Almost surely, 2^20856516454 is an apocalyptic number.

20856516454 is a deficient number, since it is larger than the sum of its proper divisors (10538805986).

20856516454 is a wasteful number, since it uses less digits than its factorization.

20856516454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36849254.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 20856516454 in words is "twenty billion, eight hundred fifty-six million, five hundred sixteen thousand, four hundred fifty-four".