20597559854 has 4 divisors (see below), whose sum is σ = 30896339784. Its totient is φ = 10298779926.

The previous prime is 20597559833. The next prime is 20597559887. The reversal of 20597559854 is 45895579502.

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

It is a super-2 number, since 2×20597559854² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20597559793 and 20597559802.

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 as a sum of consecutive naturals, namely, 5149389962 + ... + 5149389965.

It is an arithmetic number, because the mean of its divisors is an integer number (7724084946).

Almost surely, 2^20597559854 is an apocalyptic number.

20597559854 is a deficient number, since it is larger than the sum of its proper divisors (10298779930).

20597559854 is a wasteful number, since it uses less digits than its factorization.

20597559854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10298779929.

The product of its (nonzero) digits is 22680000, while the sum is 59.

The spelling of 20597559854 in words is "twenty billion, five hundred ninety-seven million, five hundred fifty-nine thousand, eight hundred fifty-four".