20748818 has 4 divisors (see below), whose sum is σ = 31123230. Its totient is φ = 10374408.

The previous prime is 20748809. The next prime is 20748821. The reversal of 20748818 is 81884702.

It is a happy number.

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., 17447329 + 3301489 = 4177^2 + 1817^2 .

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, 5187203 + ... + 5187206.

Almost surely, 2^20748818 is an apocalyptic number.

20748818 is a deficient number, since it is larger than the sum of its proper divisors (10374412).

20748818 is a wasteful number, since it uses less digits than its factorization.

20748818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374411.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 20748818 is about 4555.0870463691. The cubic root of 20748818 is about 274.7880151450.

The spelling of 20748818 in words is "twenty million, seven hundred forty-eight thousand, eight hundred eighteen".