20506049 has 2 divisors, whose sum is σ = 20506050. Its totient is φ = 20506048.

The previous prime is 20506043. The next prime is 20506051. The reversal of 20506049 is 94060502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10627600 + 9878449 = 3260^2 + 3143^2 .

It is a cyclic number.

It is not a de Polignac number, because 20506049 - 2¹⁶ = 20440513 is a prime.

Together with 20506051, 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 (20506043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10253024 + 10253025.

It is an arithmetic number, because the mean of its divisors is an integer number (10253025).

Almost surely, 2^20506049 is an apocalyptic number.

It is an amenable number.

20506049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20506049 is an equidigital number, since it uses as much as digits as its factorization.

20506049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 20506049 is about 4528.3605201000. The cubic root of 20506049 is about 273.7121001443.

The spelling of 20506049 in words is "twenty million, five hundred six thousand, forty-nine".