20645030 has 32 divisors (see below), whose sum is σ = 44319744. Its totient is φ = 6770016.

The previous prime is 20644997. The next prime is 20645033. The reversal of 20645030 is 3054602.

It is a junction number, because it is equal to n+sod(n) for n = 20644993 and 20645011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4802 + ... + 8021.

It is an arithmetic number, because the mean of its divisors is an integer number (1384992).

Almost surely, 2^20645030 is an apocalyptic number.

20645030 is an abundant number, since it is smaller than the sum of its proper divisors (23674714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20645030 is a wasteful number, since it uses less digits than its factorization.

20645030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12860.

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

The square root of 20645030 is about 4543.6802264244. The cubic root of 20645030 is about 274.3290752019.

Adding to 20645030 its reverse (3054602), we get a palindrome (23699632).

The spelling of 20645030 in words is "twenty million, six hundred forty-five thousand, thirty".