20779937 has 2 divisors, whose sum is σ = 20779938. Its totient is φ = 20779936.

The previous prime is 20779919. The next prime is 20779973. The reversal of 20779937 is 73997702.

Together with next prime (20779973) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 22801 = 4556^2 + 151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20779937 - 2⁶ = 20779873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20779037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10389968 + 10389969.

It is an arithmetic number, because the mean of its divisors is an integer number (10389969).

Almost surely, 2^20779937 is an apocalyptic number.

It is an amenable number.

20779937 is a deficient number, since it is larger than the sum of its proper divisors (1).

20779937 is an equidigital number, since it uses as much as digits as its factorization.

20779937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 166698, while the sum is 44.

The square root of 20779937 is about 4558.5016178565. The cubic root of 20779937 is about 274.9253218712.

The spelling of 20779937 in words is "twenty million, seven hundred seventy-nine thousand, nine hundred thirty-seven".