20730718 has 16 divisors (see below), whose sum is σ = 33191424. Its totient is φ = 9676800.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730718 is 81703702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730719) 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, 1918 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (2074464).

Almost surely, 2^20730718 is an apocalyptic number.

20730718 is a deficient number, since it is larger than the sum of its proper divisors (12460706).

20730718 is a wasteful number, since it uses less digits than its factorization.

20730718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4947.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20730718 is about 4553.0998231974. The cubic root of 20730718 is about 274.7080891461.

The spelling of 20730718 in words is "twenty million, seven hundred thirty thousand, seven hundred eighteen".