20559467078 has 4 divisors (see below), whose sum is σ = 30839200620. Its totient is φ = 10279733538.

The previous prime is 20559467077. The next prime is 20559467081. The reversal of 20559467078 is 87076495502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87076495502 = 2 ⋅43538247751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20559467077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5139866768 + ... + 5139866771.

It is an arithmetic number, because the mean of its divisors is an integer number (7709800155).

Almost surely, 2^20559467078 is an apocalyptic number.

20559467078 is a deficient number, since it is larger than the sum of its proper divisors (10279733542).

20559467078 is a wasteful number, since it uses less digits than its factorization.

20559467078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10279733541.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 20559467078 in words is "twenty billion, five hundred fifty-nine million, four hundred sixty-seven thousand, seventy-eight".