20949172 has 24 divisors (see below), whose sum is σ = 38746400. Its totient is φ = 9883296.

The previous prime is 20949167. The next prime is 20949199. The reversal of 20949172 is 27194902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27979 + ... + 28717.

Almost surely, 2^20949172 is an apocalyptic number.

It is an amenable number.

20949172 is a deficient number, since it is larger than the sum of its proper divisors (17797228).

20949172 is a wasteful number, since it uses less digits than its factorization.

20949172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1133 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 20949172 is about 4577.0265456954. The cubic root of 20949172 is about 275.6696495626.

The spelling of 20949172 in words is "twenty million, nine hundred forty-nine thousand, one hundred seventy-two".