20730684 has 48 divisors (see below), whose sum is σ = 55163808. Its totient is φ = 6002688.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730684 is 48603702.

It is a super-2 number, since 2×20730684² = 859522518215712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1257 + ... + 6560.

It is an arithmetic number, because the mean of its divisors is an integer number (1149246).

Almost surely, 2^20730684 is an apocalyptic number.

It is an amenable number.

20730684 is an abundant number, since it is smaller than the sum of its proper divisors (34433124).

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

20730684 is a wasteful number, since it uses less digits than its factorization.

20730684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7854 (or 7852 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20730684 is about 4553.0960894758. The cubic root of 20730684 is about 274.7079389651.

The spelling of 20730684 in words is "twenty million, seven hundred thirty thousand, six hundred eighty-four".