20730418 has 8 divisors (see below), whose sum is σ = 32167980. Its totient is φ = 10007760.

The previous prime is 20730407. The next prime is 20730421. The reversal of 20730418 is 81403702.

It can be written as a sum of positive squares in 2 ways, for example, as 20548089 + 182329 = 4533^2 + 427^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20730392 and 20730401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178653 + ... + 178768.

Almost surely, 2^20730418 is an apocalyptic number.

20730418 is a deficient number, since it is larger than the sum of its proper divisors (11437562).

20730418 is a wasteful number, since it uses less digits than its factorization.

20730418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357452.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20730418 is about 4553.0668784897. The cubic root of 20730418 is about 274.7067640139.

It can be divided in two parts, 207 and 30418, that added together give a square (30625 = 175²).

The spelling of 20730418 in words is "twenty million, seven hundred thirty thousand, four hundred eighteen".