20052211561 has 8 divisors (see below), whose sum is σ = 20095705224. Its totient is φ = 20008765440.

The previous prime is 20052211547. The next prime is 20052211573. The reversal of 20052211561 is 16511225002.

It can be written as a sum of positive squares in 4 ways, for example, as 6159110400 + 13893101161 = 78480^2 + 117869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20052211561 - 2²⁷ = 19917993833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20052211511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 908031 + ... + 929851.

It is an arithmetic number, because the mean of its divisors is an integer number (2511963153).

Almost surely, 2^20052211561 is an apocalyptic number.

It is an amenable number.

20052211561 is a deficient number, since it is larger than the sum of its proper divisors (43493663).

20052211561 is a wasteful number, since it uses less digits than its factorization.

20052211561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23771.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20052211561 its reverse (16511225002), we get a palindrome (36563436563).

The spelling of 20052211561 in words is "twenty billion, fifty-two million, two hundred eleven thousand, five hundred sixty-one".