20637213739 has 2 divisors, whose sum is σ = 20637213740. Its totient is φ = 20637213738.

The previous prime is 20637213713. The next prime is 20637213787. The reversal of 20637213739 is 93731273602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20637213739 - 2⁹ = 20637213227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20637213695 and 20637213704.

It is not a weakly prime, because it can be changed into another prime (20637213439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318606869 + 10318606870.

It is an arithmetic number, because the mean of its divisors is an integer number (10318606870).

Almost surely, 2^20637213739 is an apocalyptic number.

20637213739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20637213739 is an equidigital number, since it uses as much as digits as its factorization.

20637213739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 43.

The spelling of 20637213739 in words is "twenty billion, six hundred thirty-seven million, two hundred thirteen thousand, seven hundred thirty-nine".