20616712061 has 4 divisors (see below), whose sum is σ = 22490958624. Its totient is φ = 18742465500.

The previous prime is 20616712007. The next prime is 20616712063. The reversal of 20616712061 is 16021761602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20616712061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20616712063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937123265 + ... + 937123286.

It is an arithmetic number, because the mean of its divisors is an integer number (5622739656).

Almost surely, 2^20616712061 is an apocalyptic number.

It is an amenable number.

20616712061 is a deficient number, since it is larger than the sum of its proper divisors (1874246563).

20616712061 is a wasteful number, since it uses less digits than its factorization.

20616712061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874246562.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 20616712061 in words is "twenty billion, six hundred sixteen million, seven hundred twelve thousand, sixty-one".