20943172 has 12 divisors (see below), whose sum is σ = 36885100. Its totient is φ = 10404576.

The previous prime is 20943163. The next prime is 20943199. The reversal of 20943172 is 27134902.

It can be written as a sum of positive squares in 2 ways, for example, as 14622976 + 6320196 = 3824^2 + 2514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20943172.

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, 16047 + ... + 17302.

Almost surely, 2^20943172 is an apocalyptic number.

It is an amenable number.

20943172 is a deficient number, since it is larger than the sum of its proper divisors (15941928).

20943172 is a wasteful number, since it uses less digits than its factorization.

20943172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33510 (or 33508 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20943172 is about 4576.3710513900. The cubic root of 20943172 is about 275.6433290978.

It can be divided in two parts, 20943 and 172, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20943172 in words is "twenty million, nine hundred forty-three thousand, one hundred seventy-two".