20310256747 has 4 divisors (see below), whose sum is σ = 22156643736. Its totient is φ = 18463869760.

The previous prime is 20310256741. The next prime is 20310256823. The reversal of 20310256747 is 74765201302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310256747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20310256741) 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, 923193478 + ... + 923193499.

It is an arithmetic number, because the mean of its divisors is an integer number (5539160934).

Almost surely, 2^20310256747 is an apocalyptic number.

20310256747 is a deficient number, since it is larger than the sum of its proper divisors (1846386989).

20310256747 is a wasteful number, since it uses less digits than its factorization.

20310256747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846386988.

The product of its (nonzero) digits is 70560, while the sum is 37.

The spelling of 20310256747 in words is "twenty billion, three hundred ten million, two hundred fifty-six thousand, seven hundred forty-seven".