20730782 has 8 divisors (see below), whose sum is σ = 31136952. Its totient is φ = 10351800.

The previous prime is 20730781. The next prime is 20730799. The reversal of 20730782 is 28703702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4769 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (3892119).

Almost surely, 2^20730782 is an apocalyptic number.

20730782 is a deficient number, since it is larger than the sum of its proper divisors (10406170).

20730782 is a wasteful number, since it uses less digits than its factorization.

20730782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13594.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20730782 is about 4553.1068513708. The cubic root of 20730782 is about 274.7083718393.

It can be divided in two parts, 20730 and 782, that added together give a palindrome (21512).

The spelling of 20730782 in words is "twenty million, seven hundred thirty thousand, seven hundred eighty-two".