20154213 has 6 divisors (see below), whose sum is σ = 29111654. Its totient is φ = 13436136.

The previous prime is 20154191. The next prime is 20154227. The reversal of 20154213 is 31245102.

It can be written as a sum of positive squares in only one way, i.e., 18948609 + 1205604 = 4353^2 + 1098^2 .

It is not a de Polignac number, because 20154213 - 2⁵ = 20154181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20154313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1119670 + ... + 1119687.

Almost surely, 2^20154213 is an apocalyptic number.

It is an amenable number.

20154213 is a deficient number, since it is larger than the sum of its proper divisors (8957441).

20154213 is a wasteful number, since it uses less digits than its factorization.

20154213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239363 (or 2239360 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20154213 is about 4489.3443842058. The cubic root of 20154213 is about 272.1376402934.

Adding to 20154213 its reverse (31245102), we get a palindrome (51399315).

The spelling of 20154213 in words is "twenty million, one hundred fifty-four thousand, two hundred thirteen".