20618172 has 24 divisors (see below), whose sum is σ = 53454800. Its totient is φ = 6872688.

The previous prime is 20618141. The next prime is 20618197. The reversal of 20618172 is 27181602.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95347 + ... + 95562.

Almost surely, 2^20618172 is an apocalyptic number.

It is an amenable number.

20618172 is an abundant number, since it is smaller than the sum of its proper divisors (32836628).

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

20618172 is a wasteful number, since it uses less digits than its factorization.

20618172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190922 (or 190914 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20618172 is about 4540.7237308605. The cubic root of 20618172 is about 274.2100614458.

Adding to 20618172 its reverse (27181602), we get a palindrome (47799774).

The spelling of 20618172 in words is "twenty million, six hundred eighteen thousand, one hundred seventy-two".