20473365637 has 2 divisors, whose sum is σ = 20473365638. Its totient is φ = 20473365636.

The previous prime is 20473365631. The next prime is 20473365667. The reversal of 20473365637 is 73656337402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11050004161 + 9423361476 = 105119^2 + 97074^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20473365637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20473365631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10236682818 + 10236682819.

It is an arithmetic number, because the mean of its divisors is an integer number (10236682819).

Almost surely, 2^20473365637 is an apocalyptic number.

It is an amenable number.

20473365637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20473365637 is an equidigital number, since it uses as much as digits as its factorization.

20473365637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 46.

The spelling of 20473365637 in words is "twenty billion, four hundred seventy-three million, three hundred sixty-five thousand, six hundred thirty-seven".