20623573 has 2 divisors, whose sum is σ = 20623574. Its totient is φ = 20623572.

The previous prime is 20623513. The next prime is 20623579. The reversal of 20623573 is 37532602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20584369 + 39204 = 4537^2 + 198^2 .

It is a cyclic number.

It is not a de Polignac number, because 20623573 - 2⁹ = 20623061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20623579) 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, 10311786 + 10311787.

It is an arithmetic number, because the mean of its divisors is an integer number (10311787).

Almost surely, 2^20623573 is an apocalyptic number.

It is an amenable number.

20623573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623573 is an equidigital number, since it uses as much as digits as its factorization.

20623573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 20623573 is about 4541.3184208994. The cubic root of 20623573 is about 274.2340027736.

The spelling of 20623573 in words is "twenty million, six hundred twenty-three thousand, five hundred seventy-three".