20856030854 has 4 divisors (see below), whose sum is σ = 31284046284. Its totient is φ = 10428015426.

The previous prime is 20856030841. The next prime is 20856030863. The reversal of 20856030854 is 45803065802.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5214007712 + ... + 5214007715.

It is an arithmetic number, because the mean of its divisors is an integer number (7821011571).

Almost surely, 2^20856030854 is an apocalyptic number.

20856030854 is a deficient number, since it is larger than the sum of its proper divisors (10428015430).

20856030854 is a wasteful number, since it uses less digits than its factorization.

20856030854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10428015429.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20856030854 in words is "twenty billion, eight hundred fifty-six million, thirty thousand, eight hundred fifty-four".