20739744287 has 2 divisors, whose sum is σ = 20739744288. Its totient is φ = 20739744286.

The previous prime is 20739744257. The next prime is 20739744317. The reversal of 20739744287 is 78244793702.

It is a balanced prime because it is at equal distance from previous prime (20739744257) and next prime (20739744317).

It is a cyclic number.

It is not a de Polignac number, because 20739744287 - 2²² = 20735549983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20739744257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10369872143 + 10369872144.

It is an arithmetic number, because the mean of its divisors is an integer number (10369872144).

Almost surely, 2^20739744287 is an apocalyptic number.

20739744287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20739744287 is an equidigital number, since it uses as much as digits as its factorization.

20739744287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 20739744287 in words is "twenty billion, seven hundred thirty-nine million, seven hundred forty-four thousand, two hundred eighty-seven".