20064005561 has 8 divisors (see below), whose sum is σ = 20130642048. Its totient is φ = 19997406000.

The previous prime is 20064005531. The next prime is 20064005623. The reversal of 20064005561 is 16550046002.

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 20064005561 - 2¹⁴ = 20063989177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20064005501) 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, 1456496 + ... + 1470206.

It is an arithmetic number, because the mean of its divisors is an integer number (2516330256).

Almost surely, 2^20064005561 is an apocalyptic number.

It is an amenable number.

20064005561 is a deficient number, since it is larger than the sum of its proper divisors (66636487).

20064005561 is a wasteful number, since it uses less digits than its factorization.

20064005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18463.

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 20064005561 in words is "twenty billion, sixty-four million, five thousand, five hundred sixty-one".