20917192 has 16 divisors (see below), whose sum is σ = 39960540. Its totient is φ = 10261056.

The previous prime is 20917187. The next prime is 20917223. The reversal of 20917192 is 29171902.

It can be written as a sum of positive squares in 2 ways, for example, as 16532356 + 4384836 = 4066^2 + 2094^2 .

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, 24243 + ... + 25090.

Almost surely, 2^20917192 is an apocalyptic number.

It is an amenable number.

20917192 is a deficient number, since it is larger than the sum of its proper divisors (19043348).

20917192 is a wasteful number, since it uses less digits than its factorization.

20917192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49392 (or 49388 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 20917192 is about 4573.5316769429. The cubic root of 20917192 is about 275.5293034400.

The spelling of 20917192 in words is "twenty million, nine hundred seventeen thousand, one hundred ninety-two".