20542215 has 16 divisors (see below), whose sum is σ = 33756768. Its totient is φ = 10659456.

The previous prime is 20542213. The next prime is 20542253. The reversal of 20542215 is 51224502.

It is a happy number.

It is not a de Polignac number, because 20542215 - 2¹ = 20542213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20542191 and 20542200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542213) 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 15 ways as a sum of consecutive naturals, for example, 17952 + ... + 19061.

It is an arithmetic number, because the mean of its divisors is an integer number (2109798).

Almost surely, 2^20542215 is an apocalyptic number.

20542215 is a deficient number, since it is larger than the sum of its proper divisors (13214553).

20542215 is a wasteful number, since it uses less digits than its factorization.

20542215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37058.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20542215 is about 4532.3520384013. The cubic root of 20542215 is about 273.8729186737.

Adding to 20542215 its reverse (51224502), we get a palindrome (71766717).

The spelling of 20542215 in words is "twenty million, five hundred forty-two thousand, two hundred fifteen".