20321612 has 6 divisors (see below), whose sum is σ = 35562828. Its totient is φ = 10160804.

The previous prime is 20321603. The next prime is 20321617. The reversal of 20321612 is 21612302.

It is not an unprimeable number, because it can be changed into a prime (20321617) 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, 2540198 + ... + 2540205.

It is an arithmetic number, because the mean of its divisors is an integer number (5927138).

Almost surely, 2^20321612 is an apocalyptic number.

It is an amenable number.

20321612 is a deficient number, since it is larger than the sum of its proper divisors (15241216).

20321612 is a wasteful number, since it uses less digits than its factorization.

20321612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080407 (or 5080405 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20321612 is about 4507.9498666245. The cubic root of 20321612 is about 272.8890137305.

Adding to 20321612 its reverse (21612302), we get a palindrome (41933914).

The spelling of 20321612 in words is "twenty million, three hundred twenty-one thousand, six hundred twelve".