20730866 has 16 divisors (see below), whose sum is σ = 34945344. Its totient is φ = 9151824.

The previous prime is 20730839. The next prime is 20730869. The reversal of 20730866 is 66803702.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20730869) 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, 16736 + ... + 17931.

It is an arithmetic number, because the mean of its divisors is an integer number (2184084).

Almost surely, 2^20730866 is an apocalyptic number.

20730866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20730866 is a deficient number, since it is larger than the sum of its proper divisors (14214478).

20730866 is a wasteful number, since it uses less digits than its factorization.

20730866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34705.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20730866 is about 4553.1160758320. The cubic root of 20730866 is about 274.7087428733.

The spelling of 20730866 in words is "twenty million, seven hundred thirty thousand, eight hundred sixty-six".