20667494 has 4 divisors (see below), whose sum is σ = 31001244. Its totient is φ = 10333746.

The previous prime is 20667481. The next prime is 20667503. The reversal of 20667494 is 49476602.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5166872 + ... + 5166875.

It is an arithmetic number, because the mean of its divisors is an integer number (7750311).

Almost surely, 2^20667494 is an apocalyptic number.

20667494 is a deficient number, since it is larger than the sum of its proper divisors (10333750).

20667494 is a wasteful number, since it uses less digits than its factorization.

20667494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10333749.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 20667494 is about 4546.1515592862. The cubic root of 20667494 is about 274.4285389233.

The spelling of 20667494 in words is "twenty million, six hundred sixty-seven thousand, four hundred ninety-four".