20479904578 has 16 divisors (see below), whose sum is σ = 35165695680. Its totient is φ = 8762780016.

The previous prime is 20479904569. The next prime is 20479904579. The reversal of 20479904578 is 87540997402.

It is not an unprimeable number, because it can be changed into a prime (20479904579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1184608 + ... + 1201771.

It is an arithmetic number, because the mean of its divisors is an integer number (2197855980).

Almost surely, 2^20479904578 is an apocalyptic number.

20479904578 is a deficient number, since it is larger than the sum of its proper divisors (14685791102).

20479904578 is a wasteful number, since it uses less digits than its factorization.

20479904578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2387001.

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 20479904578 in words is "twenty billion, four hundred seventy-nine million, nine hundred four thousand, five hundred seventy-eight".