20006011261 has 4 divisors (see below), whose sum is σ = 20304608512. Its totient is φ = 19707414012.

The previous prime is 20006011243. The next prime is 20006011279. The reversal of 20006011261 is 16211060002.

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 an interprime number because it is at equal distance from previous prime (20006011243) and next prime (20006011279).

It is a cyclic number.

It is not a de Polignac number, because 20006011261 - 2⁵ = 20006011229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006011061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149298525 + ... + 149298658.

It is an arithmetic number, because the mean of its divisors is an integer number (5076152128).

Almost surely, 2^20006011261 is an apocalyptic number.

It is an amenable number.

20006011261 is a deficient number, since it is larger than the sum of its proper divisors (298597251).

20006011261 is an equidigital number, since it uses as much as digits as its factorization.

20006011261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298597250.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20006011261 its reverse (16211060002), we get a palindrome (36217071263).

The spelling of 20006011261 in words is "twenty billion, six million, eleven thousand, two hundred sixty-one".