20644046 has 8 divisors (see below), whose sum is σ = 31016304. Its totient is φ = 10305280.

The previous prime is 20644037. The next prime is 20644049. The reversal of 20644046 is 64044602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644049) 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 3 ways as a sum of consecutive naturals, for example, 6770 + ... + 9333.

It is an arithmetic number, because the mean of its divisors is an integer number (3877038).

Almost surely, 2^20644046 is an apocalyptic number.

20644046 is a deficient number, since it is larger than the sum of its proper divisors (10372258).

20644046 is a wasteful number, since it uses less digits than its factorization.

20644046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16746.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 20644046 is about 4543.5719428661. The cubic root of 20644046 is about 274.3247167018.

Adding to 20644046 its reverse (64044602), we get a palindrome (84688648).

The spelling of 20644046 in words is "twenty million, six hundred forty-four thousand, forty-six".