20353172 has 12 divisors (see below), whose sum is σ = 40706400. Its totient is φ = 8722776.

The previous prime is 20353153. The next prime is 20353187. The reversal of 20353172 is 27135302.

20353172 is an admirable number.

It is a super-3 number, since 3×20353172³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363422 + ... + 363477.

It is an arithmetic number, because the mean of its divisors is an integer number (3392200).

Almost surely, 2^20353172 is an apocalyptic number.

It is an amenable number.

20353172 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20353172 is a wasteful number, since it uses less digits than its factorization.

20353172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726910 (or 726908 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20353172 is about 4511.4489911779. The cubic root of 20353172 is about 273.0302086105.

Adding to 20353172 its reverse (27135302), we get a palindrome (47488474).

The spelling of 20353172 in words is "twenty million, three hundred fifty-three thousand, one hundred seventy-two".