20670344 has 8 divisors (see below), whose sum is σ = 38756910. Its totient is φ = 10335168.

The previous prime is 20670341. The next prime is 20670361. The reversal of 20670344 is 44307602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15697444 + 4972900 = 3962^2 + 2230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20670341) 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 as a sum of consecutive naturals, namely, 1291889 + ... + 1291904.

Almost surely, 2^20670344 is an apocalyptic number.

It is an amenable number.

20670344 is a deficient number, since it is larger than the sum of its proper divisors (18086566).

20670344 is a wasteful number, since it uses less digits than its factorization.

20670344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583799 (or 2583795 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20670344 is about 4546.4650004152. The cubic root of 20670344 is about 274.4411526988.

Adding to 20670344 its reverse (44307602), we get a palindrome (64977946).

The spelling of 20670344 in words is "twenty million, six hundred seventy thousand, three hundred forty-four".