20441213 has 4 divisors (see below), whose sum is σ = 22013628. Its totient is φ = 18868800.

The previous prime is 20441203. The next prime is 20441233. The reversal of 20441213 is 31214402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31214402 = 2 ⋅15607201.

It can be written as a sum of positive squares in 2 ways, for example, as 1968409 + 18472804 = 1403^2 + 4298^2 .

It is a cyclic number.

It is not a de Polignac number, because 20441213 - 2⁸ = 20440957 is a prime.

It is a super-2 number, since 2×20441213² = 835686377822738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20441191 and 20441200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20441203) 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, 786188 + ... + 786213.

It is an arithmetic number, because the mean of its divisors is an integer number (5503407).

Almost surely, 2^20441213 is an apocalyptic number.

It is an amenable number.

20441213 is a deficient number, since it is larger than the sum of its proper divisors (1572415).

20441213 is a wasteful number, since it uses less digits than its factorization.

20441213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572414.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20441213 is about 4521.1959700946. The cubic root of 20441213 is about 273.4233213851.

Adding to 20441213 its reverse (31214402), we get a palindrome (51655615).

The spelling of 20441213 in words is "twenty million, four hundred forty-one thousand, two hundred thirteen".