20669371 has 8 divisors (see below), whose sum is σ = 21254688. Its totient is φ = 20088000.

The previous prime is 20669357. The next prime is 20669381. The reversal of 20669371 is 17396602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20669371 - 2⁵ = 20669339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20669381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11941 + ... + 13561.

It is an arithmetic number, because the mean of its divisors is an integer number (2656836).

Almost surely, 2^20669371 is an apocalyptic number.

20669371 is a deficient number, since it is larger than the sum of its proper divisors (585317).

20669371 is a wasteful number, since it uses less digits than its factorization.

20669371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20669371 is about 4546.3579929434. The cubic root of 20669371 is about 274.4368464419.

The spelling of 20669371 in words is "twenty million, six hundred sixty-nine thousand, three hundred seventy-one".