20791668 has 24 divisors (see below), whose sum is σ = 48871872. Its totient is φ = 6879424.

The previous prime is 20791657. The next prime is 20791691. The reversal of 20791668 is 86619702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4680 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (2036328).

Almost surely, 2^20791668 is an apocalyptic number.

It is an amenable number.

20791668 is an abundant number, since it is smaller than the sum of its proper divisors (28080204).

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

20791668 is a wasteful number, since it uses less digits than its factorization.

20791668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12791 (or 12789 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 20791668 is about 4559.7881529738. The cubic root of 20791668 is about 274.9770471201.

The spelling of 20791668 in words is "twenty million, seven hundred ninety-one thousand, six hundred sixty-eight".