20186740 has 48 divisors (see below), whose sum is σ = 51004800. Its totient is φ = 6556032.

The previous prime is 20186723. The next prime is 20186783. The reversal of 20186740 is 4768102.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20186699 and 20186708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1135 + ... + 6454.

It is an arithmetic number, because the mean of its divisors is an integer number (1062600).

Almost surely, 2^20186740 is an apocalyptic number.

20186740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20186740 is an abundant number, since it is smaller than the sum of its proper divisors (30818060).

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

20186740 is a wasteful number, since it uses less digits than its factorization.

20186740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624 (or 7622 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20186740 is about 4492.9656130445. The cubic root of 20186740 is about 272.2839631042.

The spelling of 20186740 in words is "twenty million, one hundred eighty-six thousand, seven hundred forty".