20858734255 has 4 divisors (see below), whose sum is σ = 25030481112. Its totient is φ = 16686987400.

The previous prime is 20858734241. The next prime is 20858734301. The reversal of 20858734255 is 55243785802.

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

It is not a de Polignac number, because 20858734255 - 2¹¹ = 20858732207 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20858734199 and 20858734208.

It is a congruent number.

It is an unprimeable number.

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, 2085873421 + ... + 2085873430.

It is an arithmetic number, because the mean of its divisors is an integer number (6257620278).

Almost surely, 2^20858734255 is an apocalyptic number.

20858734255 is a deficient number, since it is larger than the sum of its proper divisors (4171746857).

20858734255 is an equidigital number, since it uses as much as digits as its factorization.

20858734255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4171746856.

The product of its (nonzero) digits is 2688000, while the sum is 49.

The spelling of 20858734255 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-four thousand, two hundred fifty-five".