20748787 has 4 divisors (see below), whose sum is σ = 20900376. Its totient is φ = 20597200.

The previous prime is 20748773. The next prime is 20748803. The reversal of 20748787 is 78784702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20748787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20748727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75589 + ... + 75862.

It is an arithmetic number, because the mean of its divisors is an integer number (5225094).

Almost surely, 2^20748787 is an apocalyptic number.

20748787 is a deficient number, since it is larger than the sum of its proper divisors (151589).

20748787 is a wasteful number, since it uses less digits than its factorization.

20748787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151588.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 20748787 is about 4555.0836435789. The cubic root of 20748787 is about 274.7878782949.

The spelling of 20748787 in words is "twenty million, seven hundred forty-eight thousand, seven hundred eighty-seven".