20742766 has 8 divisors (see below), whose sum is σ = 33942744. Its totient is φ = 9428520.

The previous prime is 20742763. The next prime is 20742797. The reversal of 20742766 is 66724702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20742763) 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, 471405 + ... + 471448.

It is an arithmetic number, because the mean of its divisors is an integer number (4242843).

Almost surely, 2^20742766 is an apocalyptic number.

20742766 is a deficient number, since it is larger than the sum of its proper divisors (13199978).

20742766 is a wasteful number, since it uses less digits than its factorization.

20742766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942866.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20742766 is about 4554.4226856979. The cubic root of 20742766 is about 274.7612958915.

The spelling of 20742766 in words is "twenty million, seven hundred forty-two thousand, seven hundred sixty-six".