20503535 has 16 divisors (see below), whose sum is σ = 26685120. Its totient is φ = 15033600.

The previous prime is 20503529. The next prime is 20503537. The reversal of 20503535 is 53530502.

It is a happy number.

It is not a de Polignac number, because 20503535 - 2⁴ = 20503519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20503535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503537) 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 in 15 ways as a sum of consecutive naturals, for example, 8771 + ... + 10859.

It is an arithmetic number, because the mean of its divisors is an integer number (1667820).

Almost surely, 2^20503535 is an apocalyptic number.

20503535 is a deficient number, since it is larger than the sum of its proper divisors (6181585).

20503535 is a wasteful number, since it uses less digits than its factorization.

20503535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258.

The product of its (nonzero) digits is 2250, while the sum is 23.

The square root of 20503535 is about 4528.0829276858. The cubic root of 20503535 is about 273.7009141711.

The spelling of 20503535 in words is "twenty million, five hundred three thousand, five hundred thirty-five".