20124457 has 2 divisors, whose sum is σ = 20124458. Its totient is φ = 20124456.

The previous prime is 20124437. The next prime is 20124479. The reversal of 20124457 is 75442102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 2785561 = 4164^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 20124457 - 2⁷ = 20124329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20124407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062228 + 10062229.

It is an arithmetic number, because the mean of its divisors is an integer number (10062229).

Almost surely, 2^20124457 is an apocalyptic number.

It is an amenable number.

20124457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20124457 is an equidigital number, since it uses as much as digits as its factorization.

20124457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20124457 is about 4486.0290904095. The cubic root of 20124457 is about 272.0036448834.

Adding to 20124457 its reverse (75442102), we get a palindrome (95566559).

The spelling of 20124457 in words is "twenty million, one hundred twenty-four thousand, four hundred fifty-seven".