20939644 has 24 divisors (see below), whose sum is σ = 40578048. Its totient is φ = 9374640.

The previous prime is 20939641. The next prime is 20939647. The reversal of 20939644 is 44693902.

It is an interprime number because it is at equal distance from previous prime (20939641) and next prime (20939647).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20939641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 604 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (1690752).

Almost surely, 2^20939644 is an apocalyptic number.

It is an amenable number.

20939644 is a deficient number, since it is larger than the sum of its proper divisors (19638404).

20939644 is a wasteful number, since it uses less digits than its factorization.

20939644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7185 (or 7183 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20939644 is about 4575.9855769003. The cubic root of 20939644 is about 275.6278503175.

The spelling of 20939644 in words is "twenty million, nine hundred thirty-nine thousand, six hundred forty-four".