20526513 has 16 divisors (see below), whose sum is σ = 31810560. Its totient is φ = 11529936.

The previous prime is 20526503. The next prime is 20526551. The reversal of 20526513 is 31562502.

It is not a de Polignac number, because 20526513 - 2⁶ = 20526449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20526503) 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 15 ways as a sum of consecutive naturals, for example, 7045 + ... + 9522.

It is an arithmetic number, because the mean of its divisors is an integer number (1988160).

Almost surely, 2^20526513 is an apocalyptic number.

It is an amenable number.

20526513 is a deficient number, since it is larger than the sum of its proper divisors (11284047).

20526513 is a wasteful number, since it uses less digits than its factorization.

20526513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16636.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20526513 is about 4530.6194940648. The cubic root of 20526513 is about 273.8031201517.

The spelling of 20526513 in words is "twenty million, five hundred twenty-six thousand, five hundred thirteen".