20386518 has 16 divisors (see below), whose sum is σ = 41232240. Its totient is φ = 6718976.

The previous prime is 20386511. The next prime is 20386523. The reversal of 20386518 is 81568302.

It is a happy number.

It is a super-2 number, since 2×20386518² = 831220232328648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20386511) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 18555 + ... + 19622.

It is an arithmetic number, because the mean of its divisors is an integer number (2577015).

Almost surely, 2^20386518 is an apocalyptic number.

20386518 is an abundant number, since it is smaller than the sum of its proper divisors (20845722).

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

20386518 is a wasteful number, since it uses less digits than its factorization.

20386518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38271.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 20386518 is about 4515.1431870983. The cubic root of 20386518 is about 273.1792353027.

The spelling of 20386518 in words is "twenty million, three hundred eighty-six thousand, five hundred eighteen".