20669187 has 16 divisors (see below), whose sum is σ = 34359552. Its totient is φ = 10737120.

The previous prime is 20669183. The next prime is 20669189. The reversal of 20669187 is 78196602.

It is not a de Polignac number, because 20669187 - 2² = 20669183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20669183) 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, 44508 + ... + 44969.

It is an arithmetic number, because the mean of its divisors is an integer number (2147472).

Almost surely, 2^20669187 is an apocalyptic number.

20669187 is a deficient number, since it is larger than the sum of its proper divisors (13690365).

20669187 is a wasteful number, since it uses less digits than its factorization.

20669187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89498.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20669187 is about 4546.3377569204. The cubic root of 20669187 is about 274.4360320883.

The spelling of 20669187 in words is "twenty million, six hundred sixty-nine thousand, one hundred eighty-seven".