20854688815 has 8 divisors (see below), whose sum is σ = 25026409728. Its totient is φ = 16683228960.

The previous prime is 20854688797. The next prime is 20854688831. The reversal of 20854688815 is 51888645802.

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

It is not a de Polignac number, because 20854688815 - 2¹⁵ = 20854656047 is a prime.

It is a super-2 number, since 2×20854688815² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 242029 + ... + 316681.

It is an arithmetic number, because the mean of its divisors is an integer number (3128301216).

Almost surely, 2^20854688815 is an apocalyptic number.

20854688815 is a deficient number, since it is larger than the sum of its proper divisors (4171720913).

20854688815 is an equidigital number, since it uses as much as digits as its factorization.

20854688815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130529.

The product of its (nonzero) digits is 4915200, while the sum is 55.

The spelling of 20854688815 in words is "twenty billion, eight hundred fifty-four million, six hundred eighty-eight thousand, eight hundred fifteen".