20481533 has 2 divisors, whose sum is σ = 20481534. Its totient is φ = 20481532.

The previous prime is 20481497. The next prime is 20481541. The reversal of 20481533 is 33518402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18344089 + 2137444 = 4283^2 + 1462^2 .

It is a cyclic number.

It is not a de Polignac number, because 20481533 - 2⁶ = 20481469 is a prime.

It is a Sophie Germain 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 (20481553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240766 + 10240767.

It is an arithmetic number, because the mean of its divisors is an integer number (10240767).

Almost surely, 2^20481533 is an apocalyptic number.

It is an amenable number.

20481533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20481533 is an equidigital number, since it uses as much as digits as its factorization.

20481533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 20481533 is about 4525.6527705956. The cubic root of 20481533 is about 273.6029778425.

Adding to 20481533 its reverse (33518402), we get a palindrome (53999935).

The spelling of 20481533 in words is "twenty million, four hundred eighty-one thousand, five hundred thirty-three".