20635012739 has 32 divisors (see below), whose sum is σ = 23631652800. Its totient is φ = 17849894400.

The previous prime is 20635012733. The next prime is 20635012751. The reversal of 20635012739 is 93721053602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20635012739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20635012733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7526909 + ... + 7529649.

It is an arithmetic number, because the mean of its divisors is an integer number (738489150).

Almost surely, 2^20635012739 is an apocalyptic number.

20635012739 is a deficient number, since it is larger than the sum of its proper divisors (2996640061).

20635012739 is a wasteful number, since it uses less digits than its factorization.

20635012739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191.

The product of its (nonzero) digits is 68040, while the sum is 38.

The spelling of 20635012739 in words is "twenty billion, six hundred thirty-five million, twelve thousand, seven hundred thirty-nine".