20573533 has 2 divisors, whose sum is σ = 20573534. Its totient is φ = 20573532.

The previous prime is 20573521. The next prime is 20573537. The reversal of 20573533 is 33537502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 2442969 = 4258^2 + 1563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20573533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20573537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286766 + 10286767.

It is an arithmetic number, because the mean of its divisors is an integer number (10286767).

Almost surely, 2^20573533 is an apocalyptic number.

It is an amenable number.

20573533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20573533 is an equidigital number, since it uses as much as digits as its factorization.

20573533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 28.

The square root of 20573533 is about 4535.8056616218. The cubic root of 20573533 is about 274.0120272839.

The spelling of 20573533 in words is "twenty million, five hundred seventy-three thousand, five hundred thirty-three".