20520433 has 2 divisors, whose sum is σ = 20520434. Its totient is φ = 20520432.

The previous prime is 20520421. The next prime is 20520499. The reversal of 20520433 is 33402502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18809569 + 1710864 = 4337^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520433 - 2⁹ = 20519921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20520433.

It is not a weakly prime, because it can be changed into another prime (20520403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260216 + 10260217.

It is an arithmetic number, because the mean of its divisors is an integer number (10260217).

Almost surely, 2^20520433 is an apocalyptic number.

It is an amenable number.

20520433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520433 is an equidigital number, since it uses as much as digits as its factorization.

20520433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20520433 is about 4529.9484544529. The cubic root of 20520433 is about 273.7760837791.

Adding to 20520433 its reverse (33402502), we get a palindrome (53922935).

The spelling of 20520433 in words is "twenty million, five hundred twenty thousand, four hundred thirty-three".