20647877293 has 4 divisors (see below), whose sum is σ = 20648711808. Its totient is φ = 20647042780.

The previous prime is 20647877249. The next prime is 20647877309. The reversal of 20647877293 is 39277874602.

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-20647877293 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 (20647877233) 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, 378973 + ... + 430018.

It is an arithmetic number, because the mean of its divisors is an integer number (5162177952).

Almost surely, 2^20647877293 is an apocalyptic number.

It is an amenable number.

20647877293 is a deficient number, since it is larger than the sum of its proper divisors (834515).

20647877293 is an equidigital number, since it uses as much as digits as its factorization.

20647877293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834514.

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 20647877293 in words is "twenty billion, six hundred forty-seven million, eight hundred seventy-seven thousand, two hundred ninety-three".