20630693 has 4 divisors (see below), whose sum is σ = 20781420. Its totient is φ = 20479968.

The previous prime is 20630681. The next prime is 20630699. The reversal of 20630693 is 39603602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12974404 + 7656289 = 3602^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630693 - 2¹⁶ = 20565157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630699) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 75158 + ... + 75431.

It is an arithmetic number, because the mean of its divisors is an integer number (5195355).

Almost surely, 2^20630693 is an apocalyptic number.

It is an amenable number.

20630693 is a deficient number, since it is larger than the sum of its proper divisors (150727).

20630693 is a wasteful number, since it uses less digits than its factorization.

20630693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150726.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20630693 is about 4542.1022665722. The cubic root of 20630693 is about 274.2655576266.

The spelling of 20630693 in words is "twenty million, six hundred thirty thousand, six hundred ninety-three".