20748666 has 8 divisors (see below), whose sum is σ = 41497344. Its totient is φ = 6916220.

The previous prime is 20748617. The next prime is 20748677. The reversal of 20748666 is 66684702.

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

20748666 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1729050 + ... + 1729061.

It is an arithmetic number, because the mean of its divisors is an integer number (5187168).

Almost surely, 2^20748666 is an apocalyptic number.

20748666 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.

20748666 is a wasteful number, since it uses less digits than its factorization.

20748666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458116.

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 20748666 is about 4555.0703616959. The cubic root of 20748666 is about 274.7873441368.

The spelling of 20748666 in words is "twenty million, seven hundred forty-eight thousand, six hundred sixty-six".