20730007 has 4 divisors (see below), whose sum is σ = 21821080. Its totient is φ = 19638936.

The previous prime is 20729993. The next prime is 20730011. The reversal of 20730007 is 70003702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20730007 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1091053 = 20730007 / (2 + 0 + 7 + 3 + 0 + 0 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730037) 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, 545508 + ... + 545545.

It is an arithmetic number, because the mean of its divisors is an integer number (5455270).

Almost surely, 2^20730007 is an apocalyptic number.

20730007 is a deficient number, since it is larger than the sum of its proper divisors (1091073).

20730007 is a wasteful number, since it uses less digits than its factorization.

20730007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091072.

The product of its (nonzero) digits is 294, while the sum is 19.

The square root of 20730007 is about 4553.0217438532. The cubic root of 20730007 is about 274.7049485621.

Adding to 20730007 its reverse (70003702), we get a palindrome (90733709).

The spelling of 20730007 in words is "twenty million, seven hundred thirty thousand, seven".