20630045 has 4 divisors (see below), whose sum is σ = 24756060. Its totient is φ = 16504032.

The previous prime is 20630041. The next prime is 20630059. The reversal of 20630045 is 54003602.

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 15531481 + 5098564 = 3941^2 + 2258^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630045 - 2² = 20630041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20629999 and 20630026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630041) 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, 2063000 + ... + 2063009.

It is an arithmetic number, because the mean of its divisors is an integer number (6189015).

Almost surely, 2^20630045 is an apocalyptic number.

It is an amenable number.

20630045 is a deficient number, since it is larger than the sum of its proper divisors (4126015).

20630045 is an equidigital number, since it uses as much as digits as its factorization.

20630045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126014.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20630045 is about 4542.0309334041. The cubic root of 20630045 is about 274.2626860808.

Adding to 20630045 its reverse (54003602), we get a palindrome (74633647).

The spelling of 20630045 in words is "twenty million, six hundred thirty thousand, forty-five".