20748436 has 6 divisors (see below), whose sum is σ = 36309770. Its totient is φ = 10374216.

The previous prime is 20748421. The next prime is 20748443. The reversal of 20748436 is 63484702.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 498436 = 4500^2 + 706^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2593551 + ... + 2593558.

Almost surely, 2^20748436 is an apocalyptic number.

It is an amenable number.

20748436 is a deficient number, since it is larger than the sum of its proper divisors (15561334).

20748436 is a wasteful number, since it uses less digits than its factorization.

20748436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187113 (or 5187111 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 20748436 is about 4555.0451150345. The cubic root of 20748436 is about 274.7863287893.

The spelling of 20748436 in words is "twenty million, seven hundred forty-eight thousand, four hundred thirty-six".