20516051641 has 4 divisors (see below), whose sum is σ = 20516544000. Its totient is φ = 20515559284.

The previous prime is 20516051617. The next prime is 20516051657. The reversal of 20516051641 is 14615061502.

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 20516051641 - 2²⁹ = 19979180729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20516051041) 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, 177241 + ... + 269158.

It is an arithmetic number, because the mean of its divisors is an integer number (5129136000).

Almost surely, 2^20516051641 is an apocalyptic number.

It is an amenable number.

20516051641 is a deficient number, since it is larger than the sum of its proper divisors (492359).

20516051641 is an equidigital number, since it uses as much as digits as its factorization.

20516051641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492358.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 20516051641 in words is "twenty billion, five hundred sixteen million, fifty-one thousand, six hundred forty-one".