20855408554 has 8 divisors (see below), whose sum is σ = 31283733060. Its totient is φ = 10427497536.

The previous prime is 20855408521. The next prime is 20855408569. The reversal of 20855408554 is 45580455802.

It can be written as a sum of positive squares in 2 ways, for example, as 17488740025 + 3366668529 = 132245^2 + 58023^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 114912 + ... + 234340.

Almost surely, 2^20855408554 is an apocalyptic number.

20855408554 is a deficient number, since it is larger than the sum of its proper divisors (10428324506).

20855408554 is a wasteful number, since it uses less digits than its factorization.

20855408554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206744.

The product of its (nonzero) digits is 1280000, while the sum is 46.

The spelling of 20855408554 in words is "twenty billion, eight hundred fifty-five million, four hundred eight thousand, five hundred fifty-four".