20744631893 has 2 divisors, whose sum is σ = 20744631894. Its totient is φ = 20744631892.

The previous prime is 20744631877. The next prime is 20744631907. The reversal of 20744631893 is 39813644702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19508546929 + 1236084964 = 139673^2 + 35158^2 .

It is a cyclic number.

It is not a de Polignac number, because 20744631893 - 2⁴ = 20744631877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20744631793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10372315946 + 10372315947.

It is an arithmetic number, because the mean of its divisors is an integer number (10372315947).

Almost surely, 2^20744631893 is an apocalyptic number.

It is an amenable number.

20744631893 is a deficient number, since it is larger than the sum of its proper divisors (1).

20744631893 is an equidigital number, since it uses as much as digits as its factorization.

20744631893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 20744631893 in words is "twenty billion, seven hundred forty-four million, six hundred thirty-one thousand, eight hundred ninety-three".