20066961 has 8 divisors (see below), whose sum is σ = 26891200. Its totient is φ = 13310352.

The previous prime is 20066947. The next prime is 20066989. The reversal of 20066961 is 16966002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20066961 - 2²³ = 11678353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20066911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16210 + ... + 17403.

It is an arithmetic number, because the mean of its divisors is an integer number (3361400).

Almost surely, 2^20066961 is an apocalyptic number.

It is an amenable number.

20066961 is a deficient number, since it is larger than the sum of its proper divisors (6824239).

20066961 is a wasteful number, since it uses less digits than its factorization.

20066961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33815.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 20066961 is about 4479.6161665928. The cubic root of 20066961 is about 271.7443577381.

It can be divided in two parts, 200 and 66961, that added together give a triangular number (67161 = T₃₆₆).

The spelling of 20066961 in words is "twenty million, sixty-six thousand, nine hundred sixty-one".