20181492 has 18 divisors (see below), whose sum is σ = 51014418. Its totient is φ = 6727152.

The previous prime is 20181487. The next prime is 20181503. The reversal of 20181492 is 29418102.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 2842596 = 4164^2 + 1686^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 280263 + ... + 280334.

Almost surely, 2^20181492 is an apocalyptic number.

It is an amenable number.

20181492 is an abundant number, since it is smaller than the sum of its proper divisors (30832926).

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

20181492 is a wasteful number, since it uses less digits than its factorization.

20181492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560607 (or 560602 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20181492 is about 4492.3815510261. The cubic root of 20181492 is about 272.2603655994.

Adding to 20181492 its reverse (29418102), we get a palindrome (49599594).

The spelling of 20181492 in words is "twenty million, one hundred eighty-one thousand, four hundred ninety-two".