20503986 has 16 divisors (see below), whose sum is σ = 42422400. Its totient is φ = 6598928.

The previous prime is 20503981. The next prime is 20503993. The reversal of 20503986 is 68930502.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20503981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58746 + ... + 59093.

It is an arithmetic number, because the mean of its divisors is an integer number (2651400).

Almost surely, 2^20503986 is an apocalyptic number.

20503986 is an abundant number, since it is smaller than the sum of its proper divisors (21918414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20503986 is a wasteful number, since it uses less digits than its factorization.

20503986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117873.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 20503986 is about 4528.1327277367. The cubic root of 20503986 is about 273.7029209504.

The spelling of 20503986 in words is "twenty million, five hundred three thousand, nine hundred eighty-six".