20686882 has 4 divisors (see below), whose sum is σ = 31030326. Its totient is φ = 10343440.

The previous prime is 20686879. The next prime is 20686891. The reversal of 20686882 is 28868602.

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., 18757561 + 1929321 = 4331^2 + 1389^2 .

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, 5171719 + ... + 5171722.

Almost surely, 2^20686882 is an apocalyptic number.

20686882 is a deficient number, since it is larger than the sum of its proper divisors (10343444).

20686882 is a wasteful number, since it uses less digits than its factorization.

20686882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10343443.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 20686882 is about 4548.2834124535. The cubic root of 20686882 is about 274.5143251283.

The spelling of 20686882 in words is "twenty million, six hundred eighty-six thousand, eight hundred eighty-two".