20727449 has 2 divisors, whose sum is σ = 20727450. Its totient is φ = 20727448.

The previous prime is 20727433. The next prime is 20727451. The reversal of 20727449 is 94472702.

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., 12201049 + 8526400 = 3493^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 20727449 - 2⁴ = 20727433 is a prime.

Together with 20727451, 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 (20727409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10363724 + 10363725.

It is an arithmetic number, because the mean of its divisors is an integer number (10363725).

Almost surely, 2^20727449 is an apocalyptic number.

It is an amenable number.

20727449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20727449 is an equidigital number, since it uses as much as digits as its factorization.

20727449 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 20727449 is about 4552.7408228451. The cubic root of 20727449 is about 274.6936489331.

The spelling of 20727449 in words is "twenty million, seven hundred twenty-seven thousand, four hundred forty-nine".