20730686 has 8 divisors (see below), whose sum is σ = 31522224. Its totient is φ = 10223280.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730686 is 68603702.

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

It is a super-2 number, since 2×20730686² = 859522684061192, which contains 22 as substring.

It is a congruent 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, 70850 + ... + 71141.

It is an arithmetic number, because the mean of its divisors is an integer number (3940278).

Almost surely, 2^20730686 is an apocalyptic number.

20730686 is a deficient number, since it is larger than the sum of its proper divisors (10791538).

20730686 is a wasteful number, since it uses less digits than its factorization.

20730686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142066.

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

The square root of 20730686 is about 4553.0963091066. The cubic root of 20730686 is about 274.7079477993.

The spelling of 20730686 in words is "twenty million, seven hundred thirty thousand, six hundred eighty-six".