20417966 has 4 divisors (see below), whose sum is σ = 30626952. Its totient is φ = 10208982.

The previous prime is 20417963. The next prime is 20417977. The reversal of 20417966 is 66971402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66971402 = 2 ⋅33485701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20417963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104490 + ... + 5104493.

It is an arithmetic number, because the mean of its divisors is an integer number (7656738).

Almost surely, 2^20417966 is an apocalyptic number.

20417966 is a deficient number, since it is larger than the sum of its proper divisors (10208986).

20417966 is a wasteful number, since it uses less digits than its factorization.

20417966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10208985.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20417966 is about 4518.6243481839. The cubic root of 20417966 is about 273.3196308155.

The spelling of 20417966 in words is "twenty million, four hundred seventeen thousand, nine hundred sixty-six".