20995084751 has 4 divisors (see below), whose sum is σ = 21562519512. Its totient is φ = 20427649992.

The previous prime is 20995084699. The next prime is 20995084771. The reversal of 20995084751 is 15748059902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20995084751 - 2¹⁰ = 20995083727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20995084751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20995084771) 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, 283717325 + ... + 283717398.

It is an arithmetic number, because the mean of its divisors is an integer number (5390629878).

Almost surely, 2^20995084751 is an apocalyptic number.

20995084751 is a deficient number, since it is larger than the sum of its proper divisors (567434761).

20995084751 is an equidigital number, since it uses as much as digits as its factorization.

20995084751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567434760.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 20995084751 in words is "twenty billion, nine hundred ninety-five million, eighty-four thousand, seven hundred fifty-one".