20578480561 has 8 divisors (see below), whose sum is σ = 20714750784. Its totient is φ = 20442332880.

The previous prime is 20578480529. The next prime is 20578480577. The reversal of 20578480561 is 16508487502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20578480561 - 2⁵ = 20578480529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20578480261) 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, 319500 + ... + 378466.

It is an arithmetic number, because the mean of its divisors is an integer number (2589343848).

Almost surely, 2^20578480561 is an apocalyptic number.

It is an amenable number.

20578480561 is a deficient number, since it is larger than the sum of its proper divisors (136270223).

20578480561 is a wasteful number, since it uses less digits than its factorization.

20578480561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61271.

The product of its (nonzero) digits is 537600, while the sum is 46.

The spelling of 20578480561 in words is "twenty billion, five hundred seventy-eight million, four hundred eighty thousand, five hundred sixty-one".