20750806 has 4 divisors (see below), whose sum is σ = 31126212. Its totient is φ = 10375402.

The previous prime is 20750801. The next prime is 20750809. The reversal of 20750806 is 60805702.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20750801) 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, 5187700 + ... + 5187703.

It is an arithmetic number, because the mean of its divisors is an integer number (7781553).

Almost surely, 2^20750806 is an apocalyptic number.

20750806 is a deficient number, since it is larger than the sum of its proper divisors (10375406).

20750806 is a wasteful number, since it uses less digits than its factorization.

20750806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10375405.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20750806 is about 4555.3052587066. The cubic root of 20750806 is about 274.7967909241.

The spelling of 20750806 in words is "twenty million, seven hundred fifty thousand, eight hundred six".