20616352057 has 4 divisors (see below), whose sum is σ = 23561545216. Its totient is φ = 17671158900.

The previous prime is 20616352051. The next prime is 20616352073. The reversal of 20616352057 is 75025361602.

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 cyclic number.

It is not a de Polignac number, because 20616352057 - 2⁷ = 20616351929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20616352051) 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, 1472596569 + ... + 1472596582.

It is an arithmetic number, because the mean of its divisors is an integer number (5890386304).

Almost surely, 2^20616352057 is an apocalyptic number.

It is an amenable number.

20616352057 is a deficient number, since it is larger than the sum of its proper divisors (2945193159).

20616352057 is an equidigital number, since it uses as much as digits as its factorization.

20616352057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945193158.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 20616352057 in words is "twenty billion, six hundred sixteen million, three hundred fifty-two thousand, fifty-seven".