20355172 has 6 divisors (see below), whose sum is σ = 35621558. Its totient is φ = 10177584.

The previous prime is 20355157. The next prime is 20355191. The reversal of 20355172 is 27155302.

It can be written as a sum of positive squares in only one way, i.e., 15792676 + 4562496 = 3974^2 + 2136^2 .

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 as a sum of consecutive naturals, namely, 2544393 + ... + 2544400.

Almost surely, 2^20355172 is an apocalyptic number.

It is an amenable number.

20355172 is a deficient number, since it is larger than the sum of its proper divisors (15266386).

20355172 is a wasteful number, since it uses less digits than its factorization.

20355172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088797 (or 5088795 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 20355172 is about 4511.6706440076. The cubic root of 20355172 is about 273.0391514021.

The spelling of 20355172 in words is "twenty million, three hundred fifty-five thousand, one hundred seventy-two".