20730751 has 8 divisors (see below), whose sum is σ = 21773664. Its totient is φ = 19699680.

The previous prime is 20730739. The next prime is 20730757. The reversal of 20730751 is 15703702.

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

It is a cyclic number.

It is not a de Polignac number, because 20730751 - 2⁵ = 20730719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730757) 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, 741 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (2721708).

Almost surely, 2^20730751 is an apocalyptic number.

20730751 is a deficient number, since it is larger than the sum of its proper divisors (1042913).

20730751 is a wasteful number, since it uses less digits than its factorization.

20730751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 20730751 is about 4553.1034471007. The cubic root of 20730751 is about 274.7082349098.

The spelling of 20730751 in words is "twenty million, seven hundred thirty thousand, seven hundred fifty-one".