20943746 has 4 divisors (see below), whose sum is σ = 31415622. Its totient is φ = 10471872.

The previous prime is 20943737. The next prime is 20943749. The reversal of 20943746 is 64734902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 3845521 = 4135^2 + 1961^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20943749) 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, 5235935 + ... + 5235938.

Almost surely, 2^20943746 is an apocalyptic number.

20943746 is a deficient number, since it is larger than the sum of its proper divisors (10471876).

20943746 is a wasteful number, since it uses less digits than its factorization.

20943746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10471875.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 20943746 is about 4576.4337644065. The cubic root of 20943746 is about 275.6458473064.

The spelling of 20943746 in words is "twenty million, nine hundred forty-three thousand, seven hundred forty-six".