20429533 has 2 divisors, whose sum is σ = 20429534. Its totient is φ = 20429532.

The previous prime is 20429531. The next prime is 20429557. The reversal of 20429533 is 33592402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20403289 + 26244 = 4517^2 + 162^2 .

It is a cyclic number.

It is not a de Polignac number, because 20429533 - 2¹ = 20429531 is a prime.

Together with 20429531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20429531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10214766 + 10214767.

It is an arithmetic number, because the mean of its divisors is an integer number (10214767).

Almost surely, 2^20429533 is an apocalyptic number.

It is an amenable number.

20429533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20429533 is an equidigital number, since it uses as much as digits as its factorization.

20429533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20429533 is about 4519.9040919028. The cubic root of 20429533 is about 273.3712339209.

The spelling of 20429533 in words is "twenty million, four hundred twenty-nine thousand, five hundred thirty-three".