20186540 has 24 divisors (see below), whose sum is σ = 46246032. Its totient is φ = 7340480.

The previous prime is 20186527. The next prime is 20186561. The reversal of 20186540 is 4568102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45659 + ... + 46098.

It is an arithmetic number, because the mean of its divisors is an integer number (1926918).

Almost surely, 2^20186540 is an apocalyptic number.

20186540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20186540 is an abundant number, since it is smaller than the sum of its proper divisors (26059492).

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

20186540 is a wasteful number, since it uses less digits than its factorization.

20186540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91777 (or 91775 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20186540 is about 4492.9433559750. The cubic root of 20186540 is about 272.2830638840.

It can be divided in two parts, 2018 and 6540, that added together give a palindrome (8558).

The spelling of 20186540 in words is "twenty million, one hundred eighty-six thousand, five hundred forty".