20561255119 has 4 divisors (see below), whose sum is σ = 20561898280. Its totient is φ = 20560611960.

The previous prime is 20561255087. The next prime is 20561255123. The reversal of 20561255119 is 91155216502.

It is a happy number.

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 20561255119 - 2⁵ = 20561255087 is a prime.

It is a super-2 number, since 2×20561255119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561255219) 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, 270972 + ... + 338449.

It is an arithmetic number, because the mean of its divisors is an integer number (5140474570).

Almost surely, 2^20561255119 is an apocalyptic number.

20561255119 is a deficient number, since it is larger than the sum of its proper divisors (643161).

20561255119 is an equidigital number, since it uses as much as digits as its factorization.

20561255119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643160.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 20561255119 in words is "twenty billion, five hundred sixty-one million, two hundred fifty-five thousand, one hundred nineteen".