20313021 has 16 divisors (see below), whose sum is σ = 28224000. Its totient is φ = 12979008.

The previous prime is 20313001. The next prime is 20313047. The reversal of 20313021 is 12031302.

It is a happy number.

It is not a de Polignac number, because 20313021 - 2⁵ = 20312989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20312988 and 20313006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12180 + ... + 13746.

It is an arithmetic number, because the mean of its divisors is an integer number (1764000).

Almost surely, 2^20313021 is an apocalyptic number.

It is an amenable number.

20313021 is a deficient number, since it is larger than the sum of its proper divisors (7910979).

20313021 is a wasteful number, since it uses less digits than its factorization.

20313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20313021 is about 4506.9968937198. The cubic root of 20313021 is about 272.8505535277.

Adding to 20313021 its reverse (12031302), we get a palindrome (32344323).

The spelling of 20313021 in words is "twenty million, three hundred thirteen thousand, twenty-one".