20667994 has 4 divisors (see below), whose sum is σ = 31001994. Its totient is φ = 10333996.

The previous prime is 20667973. The next prime is 20668027. The reversal of 20667994 is 49976602.

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

It can be written as a sum of positive squares in only one way, i.e., 17114769 + 3553225 = 4137^2 + 1885^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20667994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5166997 + ... + 5167000.

Almost surely, 2^20667994 is an apocalyptic number.

20667994 is a deficient number, since it is larger than the sum of its proper divisors (10334000).

20667994 is a wasteful number, since it uses less digits than its factorization.

20667994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333999.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 20667994 is about 4546.2065505210. The cubic root of 20667994 is about 274.4307519502.

The spelling of 20667994 in words is "twenty million, six hundred sixty-seven thousand, nine hundred ninety-four".