20503550 has 24 divisors (see below), whose sum is σ = 39170856. Its totient is φ = 7979040.

The previous prime is 20503537. The next prime is 20503577. The reversal of 20503550 is 5530502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3692 + ... + 7391.

It is an arithmetic number, because the mean of its divisors is an integer number (1632119).

Almost surely, 2^20503550 is an apocalyptic number.

20503550 is a deficient number, since it is larger than the sum of its proper divisors (18667306).

20503550 is a wasteful number, since it uses less digits than its factorization.

20503550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11132 (or 11127 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 20.

The square root of 20503550 is about 4528.0845840156. The cubic root of 20503550 is about 273.7009809159.

The spelling of 20503550 in words is "twenty million, five hundred three thousand, five hundred fifty".