20949737 has 2 divisors, whose sum is σ = 20949738. Its totient is φ = 20949736.

The previous prime is 20949713. The next prime is 20949743. The reversal of 20949737 is 73794902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20894041 + 55696 = 4571^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 20949737 - 2⁶ = 20949673 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20949694 and 20949703.

It is not a weakly prime, because it can be changed into another prime (20949767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10474868 + 10474869.

It is an arithmetic number, because the mean of its divisors is an integer number (10474869).

Almost surely, 2^20949737 is an apocalyptic number.

It is an amenable number.

20949737 is a deficient number, since it is larger than the sum of its proper divisors (1).

20949737 is an equidigital number, since it uses as much as digits as its factorization.

20949737 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 20949737 is about 4577.0882665730. The cubic root of 20949737 is about 275.6721278141.

The spelling of 20949737 in words is "twenty million, nine hundred forty-nine thousand, seven hundred thirty-seven".