20201213 has 4 divisors (see below), whose sum is σ = 20242848. Its totient is φ = 20159580.

The previous prime is 20201191. The next prime is 20201227. The reversal of 20201213 is 31210202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31210202 = 2 ⋅15605101.

It is a cyclic number.

It is not a de Polignac number, because 20201213 - 2¹⁸ = 19939069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201194 and 20201203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20081 + ... + 21062.

It is an arithmetic number, because the mean of its divisors is an integer number (5060712).

Almost surely, 2^20201213 is an apocalyptic number.

It is an amenable number.

20201213 is a deficient number, since it is larger than the sum of its proper divisors (41635).

20201213 is an equidigital number, since it uses as much as digits as its factorization.

20201213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41634.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20201213 is about 4494.5759533019. The cubic root of 20201213 is about 272.3490194133.

Adding to 20201213 its reverse (31210202), we get a palindrome (51411415).

The spelling of 20201213 in words is "twenty million, two hundred one thousand, two hundred thirteen".