20529851 has 2 divisors, whose sum is σ = 20529852. Its totient is φ = 20529850.

The previous prime is 20529799. The next prime is 20529881. The reversal of 20529851 is 15892502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20529851 - 2²² = 16335547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20529881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10264925 + 10264926.

It is an arithmetic number, because the mean of its divisors is an integer number (10264926).

Almost surely, 2^20529851 is an apocalyptic number.

20529851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20529851 is an equidigital number, since it uses as much as digits as its factorization.

20529851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20529851 is about 4530.9878613830. The cubic root of 20529851 is about 273.8179612060.

The spelling of 20529851 in words is "twenty million, five hundred twenty-nine thousand, eight hundred fifty-one".