20394533 has 2 divisors, whose sum is σ = 20394534. Its totient is φ = 20394532.

The previous prime is 20394529. The next prime is 20394547. The reversal of 20394533 is 33549302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19651489 + 743044 = 4433^2 + 862^2 .

It is a cyclic number.

It is not a de Polignac number, because 20394533 - 2² = 20394529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20394496 and 20394505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20394523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197266 + 10197267.

It is an arithmetic number, because the mean of its divisors is an integer number (10197267).

Almost surely, 2^20394533 is an apocalyptic number.

It is an amenable number.

20394533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394533 is an equidigital number, since it uses as much as digits as its factorization.

20394533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 20394533 is about 4516.0306686293. The cubic root of 20394533 is about 273.2150309315.

The spelling of 20394533 in words is "twenty million, three hundred ninety-four thousand, five hundred thirty-three".