20559398254 has 4 divisors (see below), whose sum is σ = 30839097384. Its totient is φ = 10279699126.

The previous prime is 20559398231. The next prime is 20559398261. The reversal of 20559398254 is 45289395502.

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

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, 5139849562 + ... + 5139849565.

It is an arithmetic number, because the mean of its divisors is an integer number (7709774346).

Almost surely, 2^20559398254 is an apocalyptic number.

20559398254 is a deficient number, since it is larger than the sum of its proper divisors (10279699130).

20559398254 is a wasteful number, since it uses less digits than its factorization.

20559398254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10279699129.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 20559398254 in words is "twenty billion, five hundred fifty-nine million, three hundred ninety-eight thousand, two hundred fifty-four".