20939264 has 20 divisors (see below), whose sum is σ = 41838654. Its totient is φ = 10469376.

The previous prime is 20939263. The next prime is 20939267. The reversal of 20939264 is 46293902.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 6801664 = 3760^2 + 2608^2 .

It is not an unprimeable number, because it can be changed into a prime (20939263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19937 + ... + 20960.

Almost surely, 2^20939264 is an apocalyptic number.

It is an amenable number.

20939264 is a deficient number, since it is larger than the sum of its proper divisors (20899390).

20939264 is an frugal number, since it uses more digits than its factorization.

20939264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40915 (or 40899 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 20939264 is about 4575.9440556021. The cubic root of 20939264 is about 275.6261829982.

The spelling of 20939264 in words is "twenty million, nine hundred thirty-nine thousand, two hundred sixty-four".