20696641237 has 4 divisors (see below), whose sum is σ = 20787816096. Its totient is φ = 20605466380.

The previous prime is 20696641201. The next prime is 20696641349. The reversal of 20696641237 is 73214669602.

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-20696641237 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 (20696621237) 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, 45587089 + ... + 45587542.

It is an arithmetic number, because the mean of its divisors is an integer number (5196954024).

Almost surely, 2^20696641237 is an apocalyptic number.

It is an amenable number.

20696641237 is a deficient number, since it is larger than the sum of its proper divisors (91174859).

20696641237 is an equidigital number, since it uses as much as digits as its factorization.

20696641237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91174858.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 20696641237 in words is "twenty billion, six hundred ninety-six million, six hundred forty-one thousand, two hundred thirty-seven".