20573081 has 2 divisors, whose sum is σ = 20573082. Its totient is φ = 20573080.

The previous prime is 20573071. The next prime is 20573089. The reversal of 20573081 is 18037502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20070400 + 502681 = 4480^2 + 709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20573081 is a prime.

It is a super-2 number, since 2×20573081² = 846503323665122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20573081.

It is not a weakly prime, because it can be changed into another prime (20573089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286540 + 10286541.

It is an arithmetic number, because the mean of its divisors is an integer number (10286541).

Almost surely, 2^20573081 is an apocalyptic number.

It is an amenable number.

20573081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20573081 is an equidigital number, since it uses as much as digits as its factorization.

20573081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 20573081 is about 4535.7558355802. The cubic root of 20573081 is about 274.0100205901.

The spelling of 20573081 in words is "twenty million, five hundred seventy-three thousand, eighty-one".