20137445639 has 2 divisors, whose sum is σ = 20137445640. Its totient is φ = 20137445638.

The previous prime is 20137445623. The next prime is 20137445687. The reversal of 20137445639 is 93654473102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20137445639 - 2⁴ = 20137445623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20137445639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20137445039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068722819 + 10068722820.

It is an arithmetic number, because the mean of its divisors is an integer number (10068722820).

Almost surely, 2^20137445639 is an apocalyptic number.

20137445639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20137445639 is an equidigital number, since it uses as much as digits as its factorization.

20137445639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 20137445639 in words is "twenty billion, one hundred thirty-seven million, four hundred forty-five thousand, six hundred thirty-nine".