20533109 has 2 divisors, whose sum is σ = 20533110. Its totient is φ = 20533108.

The previous prime is 20533063. The next prime is 20533133. The reversal of 20533109 is 90133502.

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., 19624900 + 908209 = 4430^2 + 953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20533109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20533159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10266554 + 10266555.

It is an arithmetic number, because the mean of its divisors is an integer number (10266555).

Almost surely, 2^20533109 is an apocalyptic number.

It is an amenable number.

20533109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533109 is an equidigital number, since it uses as much as digits as its factorization.

20533109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 20533109 is about 4531.3473713676. The cubic root of 20533109 is about 273.8324450216.

The spelling of 20533109 in words is "twenty million, five hundred thirty-three thousand, one hundred nine".