20736222641 has 4 divisors (see below), whose sum is σ = 21827602800. Its totient is φ = 19644842484.

The previous prime is 20736222517. The next prime is 20736222713. The reversal of 20736222641 is 14622263702.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20736222641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20736222841) 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, 545690051 + ... + 545690088.

It is an arithmetic number, because the mean of its divisors is an integer number (5456900700).

Almost surely, 2^20736222641 is an apocalyptic number.

It is an amenable number.

20736222641 is a deficient number, since it is larger than the sum of its proper divisors (1091380159).

20736222641 is a wasteful number, since it uses less digits than its factorization.

20736222641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091380158.

The product of its (nonzero) digits is 48384, while the sum is 35.

The spelling of 20736222641 in words is "twenty billion, seven hundred thirty-six million, two hundred twenty-two thousand, six hundred forty-one".