20679644 has 12 divisors (see below), whose sum is σ = 36325800. Its totient is φ = 10300848.

The previous prime is 20679643. The next prime is 20679653. The reversal of 20679644 is 44697602.

It is a junction number, because it is equal to n+sod(n) for n = 20679598 and 20679607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20679641) 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, 8534 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (3027150).

Almost surely, 2^20679644 is an apocalyptic number.

It is an amenable number.

20679644 is a deficient number, since it is larger than the sum of its proper divisors (15646156).

20679644 is a wasteful number, since it uses less digits than its factorization.

20679644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19492 (or 19490 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 20679644 is about 4547.4876580371. The cubic root of 20679644 is about 274.4823053769.

It can be divided in two parts, 2067 and 9644, that added together give a palindrome (11711).

The spelling of 20679644 in words is "twenty million, six hundred seventy-nine thousand, six hundred forty-four".