20416457 has 2 divisors, whose sum is σ = 20416458. Its totient is φ = 20416456.

The previous prime is 20416453. The next prime is 20416549. The reversal of 20416457 is 75461402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 22201 = 4516^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 20416457 - 2² = 20416453 is a prime.

It is not a weakly prime, because it can be changed into another prime (20416453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208228 + 10208229.

It is an arithmetic number, because the mean of its divisors is an integer number (10208229).

Almost surely, 2^20416457 is an apocalyptic number.

It is an amenable number.

20416457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416457 is an equidigital number, since it uses as much as digits as its factorization.

20416457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 20416457 is about 4518.4573695012. The cubic root of 20416457 is about 273.3128973749.

Adding to 20416457 its reverse (75461402), we get a palindrome (95877859).

It can be divided in two parts, 204 and 16457, that added together give a palindrome (16661).

The spelling of 20416457 in words is "twenty million, four hundred sixteen thousand, four hundred fifty-seven".