20667694 has 4 divisors (see below), whose sum is σ = 31001544. Its totient is φ = 10333846.

The previous prime is 20667679. The next prime is 20667697. The reversal of 20667694 is 49676602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20667697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5166922 + ... + 5166925.

It is an arithmetic number, because the mean of its divisors is an integer number (7750386).

Almost surely, 2^20667694 is an apocalyptic number.

20667694 is a deficient number, since it is larger than the sum of its proper divisors (10333850).

20667694 is a wasteful number, since it uses less digits than its factorization.

20667694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333849.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 20667694 is about 4546.1735558599. The cubic root of 20667694 is about 274.4294241383.

The spelling of 20667694 in words is "twenty million, six hundred sixty-seven thousand, six hundred ninety-four".