20411213 has 4 divisors (see below), whose sum is σ = 20602080. Its totient is φ = 20220348.

The previous prime is 20411147. The next prime is 20411221. The reversal of 20411213 is 31211402.

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: 31211402 = 2 ⋅15605701.

It is a cyclic number.

It is not a de Polignac number, because 20411213 - 2¹⁰ = 20410189 is a prime.

It is a super-2 number, since 2×20411213² = 833235232262738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411233) 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, 95273 + ... + 95486.

It is an arithmetic number, because the mean of its divisors is an integer number (5150520).

Almost surely, 2^20411213 is an apocalyptic number.

It is an amenable number.

20411213 is a deficient number, since it is larger than the sum of its proper divisors (190867).

20411213 is a wasteful number, since it uses less digits than its factorization.

20411213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190866.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20411213 is about 4517.8770456930. The cubic root of 20411213 is about 273.2894950846.

Adding to 20411213 its reverse (31211402), we get a palindrome (51622615).

The spelling of 20411213 in words is "twenty million, four hundred eleven thousand, two hundred thirteen".