20803172 has 48 divisors (see below), whose sum is σ = 42103152. Its totient is φ = 8908800.

The previous prime is 20803169. The next prime is 20803177. The reversal of 20803172 is 27130802.

It can be written as a sum of positive squares in 8 ways, for example, as 155236 + 20647936 = 394^2 + 4544^2 .

It is a super-3 number, since 3×20803172³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20803177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89168 + ... + 89400.

It is an arithmetic number, because the mean of its divisors is an integer number (877149).

Almost surely, 2^20803172 is an apocalyptic number.

It is an amenable number.

20803172 is an abundant number, since it is smaller than the sum of its proper divisors (21299980).

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

20803172 is a wasteful number, since it uses less digits than its factorization.

20803172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20803172 is about 4561.0494406441. The cubic root of 20803172 is about 275.0277525711.

Adding to 20803172 its reverse (27130802), we get a palindrome (47933974).

The spelling of 20803172 in words is "twenty million, eight hundred three thousand, one hundred seventy-two".