20945766 has 8 divisors (see below), whose sum is σ = 41891544. Its totient is φ = 6981920.

The previous prime is 20945761. The next prime is 20945789. The reversal of 20945766 is 66754902.

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

20945766 is an admirable number.

It is a super-2 number, since 2×20945766² = 877450226653512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1745475 + ... + 1745486.

It is an arithmetic number, because the mean of its divisors is an integer number (5236443).

Almost surely, 2^20945766 is an apocalyptic number.

20945766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20945766 is a wasteful number, since it uses less digits than its factorization.

20945766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490966.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 20945766 is about 4576.6544549485. The cubic root of 20945766 is about 275.6547089289.

The spelling of 20945766 in words is "twenty million, nine hundred forty-five thousand, seven hundred sixty-six".