20161518 has 32 divisors (see below), whose sum is σ = 44253216. Its totient is φ = 6085248.

The previous prime is 20161513. The next prime is 20161523. The reversal of 20161518 is 81516102.

It is an interprime number because it is at equal distance from previous prime (20161513) and next prime (20161523).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1696 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (1382913).

Almost surely, 2^20161518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20161518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22126608).

20161518 is an abundant number, since it is smaller than the sum of its proper divisors (24091698).

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

20161518 is a wasteful number, since it uses less digits than its factorization.

20161518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 20161518 is about 4490.1579036822. The cubic root of 20161518 is about 272.1705155592.

The spelling of 20161518 in words is "twenty million, one hundred sixty-one thousand, five hundred eighteen".