20218492 has 24 divisors (see below), whose sum is σ = 40535936. Its totient is φ = 8643888.

The previous prime is 20218477. The next prime is 20218529. The reversal of 20218492 is 29481202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20218492.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17443 + ... + 18565.

Almost surely, 2^20218492 is an apocalyptic number.

It is an amenable number.

20218492 is an abundant number, since it is smaller than the sum of its proper divisors (20317444).

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

20218492 is a wasteful number, since it uses less digits than its factorization.

20218492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1775 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20218492 is about 4496.4977482481. The cubic root of 20218492 is about 272.4266480457.

Adding to 20218492 its reverse (29481202), we get a palindrome (49699694).

The spelling of 20218492 in words is "twenty million, two hundred eighteen thousand, four hundred ninety-two".