20551623254 has 4 divisors (see below), whose sum is σ = 30827434884. Its totient is φ = 10275811626.

The previous prime is 20551623217. The next prime is 20551623299. The reversal of 20551623254 is 45232615502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45232615502 = 2 ⋅22616307751.

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 as a sum of consecutive naturals, namely, 5137905812 + ... + 5137905815.

It is an arithmetic number, because the mean of its divisors is an integer number (7706858721).

Almost surely, 2^20551623254 is an apocalyptic number.

20551623254 is a deficient number, since it is larger than the sum of its proper divisors (10275811630).

20551623254 is a wasteful number, since it uses less digits than its factorization.

20551623254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275811629.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 20551623254 in words is "twenty billion, five hundred fifty-one million, six hundred twenty-three thousand, two hundred fifty-four".