20612573 has 2 divisors, whose sum is σ = 20612574. Its totient is φ = 20612572.

The previous prime is 20612567. The next prime is 20612621. The reversal of 20612573 is 37521602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20268004 + 344569 = 4502^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 20612573 - 2¹² = 20608477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20612503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306286 + 10306287.

It is an arithmetic number, because the mean of its divisors is an integer number (10306287).

Almost surely, 2^20612573 is an apocalyptic number.

It is an amenable number.

20612573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20612573 is an equidigital number, since it uses as much as digits as its factorization.

20612573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20612573 is about 4540.1071573257. The cubic root of 20612573 is about 274.1852380177.

The spelling of 20612573 in words is "twenty million, six hundred twelve thousand, five hundred seventy-three".