20660494 has 4 divisors (see below), whose sum is σ = 30990744. Its totient is φ = 10330246.

The previous prime is 20660483. The next prime is 20660501. The reversal of 20660494 is 49406602.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5165122 + ... + 5165125.

It is an arithmetic number, because the mean of its divisors is an integer number (7747686).

Almost surely, 2^20660494 is an apocalyptic number.

20660494 is a deficient number, since it is larger than the sum of its proper divisors (10330250).

20660494 is a wasteful number, since it uses less digits than its factorization.

20660494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330249.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20660494 is about 4545.3816121422. The cubic root of 20660494 is about 274.3975527977.

The spelling of 20660494 in words is "twenty million, six hundred sixty thousand, four hundred ninety-four".