20730046 has 4 divisors (see below), whose sum is σ = 31095072. Its totient is φ = 10365022.

The previous prime is 20730037. The next prime is 20730053. The reversal of 20730046 is 64003702.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20729999 and 20730026.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5182510 + ... + 5182513.

It is an arithmetic number, because the mean of its divisors is an integer number (7773768).

Almost surely, 2^20730046 is an apocalyptic number.

20730046 is a deficient number, since it is larger than the sum of its proper divisors (10365026).

20730046 is a wasteful number, since it uses less digits than its factorization.

20730046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10365025.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20730046 is about 4553.0260267211. The cubic root of 20730046 is about 274.7051208323.

Adding to 20730046 its reverse (64003702), we get a palindrome (84733748).

The spelling of 20730046 in words is "twenty million, seven hundred thirty thousand, forty-six".