20669047 has 4 divisors (see below), whose sum is σ = 23621776. Its totient is φ = 17716320.

The previous prime is 20669041. The next prime is 20669063. The reversal of 20669047 is 74096602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74096602 = 2 ⋅37048301.

It is a cyclic number.

It is not a de Polignac number, because 20669047 - 2³ = 20669039 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 (20669041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476354 + ... + 1476367.

It is an arithmetic number, because the mean of its divisors is an integer number (5905444).

Almost surely, 2^20669047 is an apocalyptic number.

20669047 is a deficient number, since it is larger than the sum of its proper divisors (2952729).

20669047 is an equidigital number, since it uses as much as digits as its factorization.

20669047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952728.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20669047 is about 4546.3223598861. The cubic root of 20669047 is about 274.4354124682.

The spelling of 20669047 in words is "twenty million, six hundred sixty-nine thousand, forty-seven".