20466728837 has 2 divisors, whose sum is σ = 20466728838. Its totient is φ = 20466728836.

The previous prime is 20466728813. The next prime is 20466728839. The reversal of 20466728837 is 73882766402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19915136641 + 551592196 = 141121^2 + 23486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20466728837 - 2²⁶ = 20399619973 is a prime.

Together with 20466728839, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20466728839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10233364418 + 10233364419.

It is an arithmetic number, because the mean of its divisors is an integer number (10233364419).

Almost surely, 2^20466728837 is an apocalyptic number.

It is an amenable number.

20466728837 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466728837 is an equidigital number, since it uses as much as digits as its factorization.

20466728837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5419008, while the sum is 53.

The spelling of 20466728837 in words is "twenty billion, four hundred sixty-six million, seven hundred twenty-eight thousand, eight hundred thirty-seven".