20433172 has 6 divisors (see below), whose sum is σ = 35758058. Its totient is φ = 10216584.

The previous prime is 20433163. The next prime is 20433173. The reversal of 20433172 is 27133402.

It can be written as a sum of positive squares in only one way, i.e., 11930116 + 8503056 = 3454^2 + 2916^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20433173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554143 + ... + 2554150.

Almost surely, 2^20433172 is an apocalyptic number.

It is an amenable number.

20433172 is a deficient number, since it is larger than the sum of its proper divisors (15324886).

20433172 is a wasteful number, since it uses less digits than its factorization.

20433172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108297 (or 5108295 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20433172 is about 4520.3066267677. The cubic root of 20433172 is about 273.3874643271.

Adding to 20433172 its reverse (27133402), we get a palindrome (47566574).

The spelling of 20433172 in words is "twenty million, four hundred thirty-three thousand, one hundred seventy-two".