20574493 has 2 divisors, whose sum is σ = 20574494. Its totient is φ = 20574492.

The previous prime is 20574461. The next prime is 20574517. The reversal of 20574493 is 39447502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20457529 + 116964 = 4523^2 + 342^2 .

It is a cyclic number.

It is not a de Polignac number, because 20574493 - 2⁵ = 20574461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20574193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10287246 + 10287247.

It is an arithmetic number, because the mean of its divisors is an integer number (10287247).

Almost surely, 2^20574493 is an apocalyptic number.

It is an amenable number.

20574493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20574493 is an equidigital number, since it uses as much as digits as its factorization.

20574493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20574493 is about 4535.9114850270. The cubic root of 20574493 is about 274.0162891909.

The spelling of 20574493 in words is "twenty million, five hundred seventy-four thousand, four hundred ninety-three".