20553433 has 2 divisors, whose sum is σ = 20553434. Its totient is φ = 20553432.

The previous prime is 20553361. The next prime is 20553443. The reversal of 20553433 is 33435502.

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., 13520329 + 7033104 = 3677^2 + 2652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20553433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20553398 and 20553407.

It is not a weakly prime, because it can be changed into another prime (20553443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276716 + 10276717.

It is an arithmetic number, because the mean of its divisors is an integer number (10276717).

Almost surely, 2^20553433 is an apocalyptic number.

It is an amenable number.

20553433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553433 is an equidigital number, since it uses as much as digits as its factorization.

20553433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 25.

The square root of 20553433 is about 4533.5894167867. The cubic root of 20553433 is about 273.9227631413.

Adding to 20553433 its reverse (33435502), we get a palindrome (53988935).

The spelling of 20553433 in words is "twenty million, five hundred fifty-three thousand, four hundred thirty-three".