20331213 has 16 divisors (see below), whose sum is σ = 31641600. Its totient is φ = 11370096.

The previous prime is 20331209. The next prime is 20331253. The reversal of 20331213 is 31213302.

It is not a de Polignac number, because 20331213 - 2² = 20331209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20331192 and 20331201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9313 + ... + 11286.

It is an arithmetic number, because the mean of its divisors is an integer number (1977600).

Almost surely, 2^20331213 is an apocalyptic number.

It is an amenable number.

20331213 is a deficient number, since it is larger than the sum of its proper divisors (11310387).

20331213 is a wasteful number, since it uses less digits than its factorization.

20331213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20656.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20331213 is about 4509.0146373681. The cubic root of 20331213 is about 272.9319826794.

Adding to 20331213 its reverse (31213302), we get a palindrome (51544515).

The spelling of 20331213 in words is "twenty million, three hundred thirty-one thousand, two hundred thirteen".