20669111 has 8 divisors (see below), whose sum is σ = 22070400. Its totient is φ = 19309752.

The previous prime is 20669107. The next prime is 20669119. The reversal of 20669111 is 11196602.

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

It is not a de Polignac number, because 20669111 - 2² = 20669107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20669119) 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, 9461 + ... + 11438.

It is an arithmetic number, because the mean of its divisors is an integer number (2758800).

Almost surely, 2^20669111 is an apocalyptic number.

20669111 is a deficient number, since it is larger than the sum of its proper divisors (1401289).

20669111 is a wasteful number, since it uses less digits than its factorization.

20669111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20965.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 20669111 is about 4546.3293985368. The cubic root of 20669111 is about 274.4356957235.

The spelling of 20669111 in words is "twenty million, six hundred sixty-nine thousand, one hundred eleven".