20561632059 has 16 divisors (see below), whose sum is σ = 28870894080. Its totient is φ = 12980685600.

The previous prime is 20561632057. The next prime is 20561632067. The reversal of 20561632059 is 95023616502.

It is not a de Polignac number, because 20561632059 - 2¹ = 20561632057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20561632057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57289 + ... + 210725.

It is an arithmetic number, because the mean of its divisors is an integer number (1804430880).

Almost surely, 2^20561632059 is an apocalyptic number.

20561632059 is a deficient number, since it is larger than the sum of its proper divisors (8309262021).

20561632059 is a wasteful number, since it uses less digits than its factorization.

20561632059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155810.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 20561632059 in words is "twenty billion, five hundred sixty-one million, six hundred thirty-two thousand, fifty-nine".