20321386 has 4 divisors (see below), whose sum is σ = 30482082. Its totient is φ = 10160692.

The previous prime is 20321377. The next prime is 20321387. The reversal of 20321386 is 68312302.

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., 11730625 + 8590761 = 3425^2 + 2931^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20321386.

It is not an unprimeable number, because it can be changed into a prime (20321387) by changing a digit.

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, 5080345 + ... + 5080348.

Almost surely, 2^20321386 is an apocalyptic number.

20321386 is a deficient number, since it is larger than the sum of its proper divisors (10160696).

20321386 is a wasteful number, since it uses less digits than its factorization.

20321386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160695.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 20321386 is about 4507.9247997277. The cubic root of 20321386 is about 272.8880021122. Note that the first 3 decimals are identical.

Adding to 20321386 its reverse (68312302), we get a palindrome (88633688).

The spelling of 20321386 in words is "twenty million, three hundred twenty-one thousand, three hundred eighty-six".