20049457 has 2 divisors, whose sum is σ = 20049458. Its totient is φ = 20049456.

The previous prime is 20049433. The next prime is 20049473. The reversal of 20049457 is 75494002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19000881 + 1048576 = 4359^2 + 1024^2 .

It is a cyclic number.

It is not a de Polignac number, because 20049457 - 2⁷ = 20049329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20049257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10024728 + 10024729.

It is an arithmetic number, because the mean of its divisors is an integer number (10024729).

Almost surely, 2^20049457 is an apocalyptic number.

It is an amenable number.

20049457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20049457 is an equidigital number, since it uses as much as digits as its factorization.

20049457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20049457 is about 4477.6620015361. The cubic root of 20049457 is about 271.6653224033.

The spelling of 20049457 in words is "twenty million, forty-nine thousand, four hundred fifty-seven".