20813882 has 8 divisors (see below), whose sum is σ = 33057396. Its totient is φ = 9794752.

The previous prime is 20813879. The next prime is 20813887. The reversal of 20813882 is 28831802.

It can be written as a sum of positive squares in 2 ways, for example, as 17131321 + 3682561 = 4139^2 + 1919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20813887) 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 in 3 ways as a sum of consecutive naturals, for example, 306053 + ... + 306120.

Almost surely, 2^20813882 is an apocalyptic number.

20813882 is a deficient number, since it is larger than the sum of its proper divisors (12243514).

20813882 is a wasteful number, since it uses less digits than its factorization.

20813882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612192.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 20813882 is about 4562.2233614763. The cubic root of 20813882 is about 275.0749415589.

The spelling of 20813882 in words is "twenty million, eight hundred thirteen thousand, eight hundred eighty-two".