20730742 has 4 divisors (see below), whose sum is σ = 31096116. Its totient is φ = 10365370.

The previous prime is 20730739. The next prime is 20730757. The reversal of 20730742 is 24703702.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182684 + ... + 5182687.

It is an arithmetic number, because the mean of its divisors is an integer number (7774029).

Almost surely, 2^20730742 is an apocalyptic number.

20730742 is a deficient number, since it is larger than the sum of its proper divisors (10365374).

20730742 is a wasteful number, since it uses less digits than its factorization.

20730742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10365373.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20730742 is about 4553.1024587637. The cubic root of 20730742 is about 274.7081951561.

The spelling of 20730742 in words is "twenty million, seven hundred thirty thousand, seven hundred forty-two".