20668047 has 8 divisors (see below), whose sum is σ = 27578544. Its totient is φ = 13768128.

The previous prime is 20668027. The next prime is 20668051. The reversal of 20668047 is 74086602.

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

It is not a de Polignac number, because 20668047 - 2¹⁶ = 20602511 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20667999 and 20668017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668027) 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, 5523 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (3447318).

Almost surely, 2^20668047 is an apocalyptic number.

20668047 is a deficient number, since it is larger than the sum of its proper divisors (6910497).

20668047 is a wasteful number, since it uses less digits than its factorization.

20668047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5289.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20668047 is about 4546.2123795529. The cubic root of 20668047 is about 274.4309865290.

The spelling of 20668047 in words is "twenty million, six hundred sixty-eight thousand, forty-seven".