20529907 has 4 divisors (see below), whose sum is σ = 20554560. Its totient is φ = 20505256.

The previous prime is 20529881. The next prime is 20529911. The reversal of 20529907 is 70992502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20529907 - 2⁷ = 20529779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20529917) 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 in 3 ways as a sum of consecutive naturals, for example, 11032 + ... + 12757.

It is an arithmetic number, because the mean of its divisors is an integer number (5138640).

Almost surely, 2^20529907 is an apocalyptic number.

20529907 is a deficient number, since it is larger than the sum of its proper divisors (24653).

20529907 is an equidigital number, since it uses as much as digits as its factorization.

20529907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24652.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 20529907 is about 4530.9940410466. The cubic root of 20529907 is about 273.8182101734.

The spelling of 20529907 in words is "twenty million, five hundred twenty-nine thousand, nine hundred seven".