20277449 has 2 divisors, whose sum is σ = 20277450. Its totient is φ = 20277448.

The previous prime is 20277419. The next prime is 20277451. The reversal of 20277449 is 94477202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14684224 + 5593225 = 3832^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 20277449 - 2²⁰ = 19228873 is a prime.

It is a super-2 number, since 2×20277449² = 822349875895202, which contains 22 as substring.

Together with 20277451, 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 (20277419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10138724 + 10138725.

It is an arithmetic number, because the mean of its divisors is an integer number (10138725).

Almost surely, 2^20277449 is an apocalyptic number.

It is an amenable number.

20277449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20277449 is an equidigital number, since it uses as much as digits as its factorization.

20277449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20277449 is about 4503.0488560530. The cubic root of 20277449 is about 272.6911892295.

The spelling of 20277449 in words is "twenty million, two hundred seventy-seven thousand, four hundred forty-nine".