20516455561053 has 4 divisors (see below), whose sum is σ = 27355274081408. Its totient is φ = 13677637040700.

The previous prime is 20516455561051. The next prime is 20516455561079. The reversal of 20516455561053 is 35016555461502.

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 not a de Polignac number, because 20516455561053 - 2¹ = 20516455561051 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20516455560993 and 20516455561011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516455561051) 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, 3419409260173 + ... + 3419409260178.

It is an arithmetic number, because the mean of its divisors is an integer number (6838818520352).

Almost surely, 2^{20516455561053} is an apocalyptic number.

It is an amenable number.

20516455561053 is a deficient number, since it is larger than the sum of its proper divisors (6838818520355).

20516455561053 is an equidigital number, since it uses as much as digits as its factorization.

20516455561053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838818520354.

The product of its (nonzero) digits is 2700000, while the sum is 48.

The spelling of 20516455561053 in words is "twenty trillion, five hundred sixteen billion, four hundred fifty-five million, five hundred sixty-one thousand, fifty-three".