20464757 has 2 divisors, whose sum is σ = 20464758. Its totient is φ = 20464756.

The previous prime is 20464751. The next prime is 20464777. The reversal of 20464757 is 75746402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10817521 + 9647236 = 3289^2 + 3106^2 .

It is a cyclic number.

It is not a de Polignac number, because 20464757 - 2¹⁶ = 20399221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20464751) 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, 10232378 + 10232379.

It is an arithmetic number, because the mean of its divisors is an integer number (10232379).

Almost surely, 2^20464757 is an apocalyptic number.

It is an amenable number.

20464757 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464757 is an equidigital number, since it uses as much as digits as its factorization.

20464757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 20464757 is about 4523.7989566293. The cubic root of 20464757 is about 273.5282565915.

The spelling of 20464757 in words is "twenty million, four hundred sixty-four thousand, seven hundred fifty-seven".