20694184937 has 2 divisors, whose sum is σ = 20694184938. Its totient is φ = 20694184936.

The previous prime is 20694184873. The next prime is 20694184939. The reversal of 20694184937 is 73948149602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17479748521 + 3214436416 = 132211^2 + 56696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20694184937 - 2⁶ = 20694184873 is a prime.

Together with 20694184939, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20694184939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347092468 + 10347092469.

It is an arithmetic number, because the mean of its divisors is an integer number (10347092469).

Almost surely, 2^20694184937 is an apocalyptic number.

It is an amenable number.

20694184937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20694184937 is an equidigital number, since it uses as much as digits as its factorization.

20694184937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 20694184937 in words is "twenty billion, six hundred ninety-four million, one hundred eighty-four thousand, nine hundred thirty-seven".