20503660 has 48 divisors (see below), whose sum is σ = 45964800. Its totient is φ = 7660224.

The previous prime is 20503627. The next prime is 20503673. The reversal of 20503660 is 6630502.

It is a congruent number.

It is an unprimeable number.

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, 29679 + ... + 30361.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^20503660 is an apocalyptic number.

20503660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20503660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22982400).

20503660 is an abundant number, since it is smaller than the sum of its proper divisors (25461140).

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

20503660 is a wasteful number, since it uses less digits than its factorization.

20503660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 20503660 is about 4528.0967304156. The cubic root of 20503660 is about 273.7014703768.

The spelling of 20503660 in words is "twenty million, five hundred three thousand, six hundred sixty".