20216542 has 8 divisors (see below), whose sum is σ = 30546576. Its totient is φ = 10034352.

The previous prime is 20216507. The next prime is 20216569. The reversal of 20216542 is 24561202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36618 + ... + 37165.

It is an arithmetic number, because the mean of its divisors is an integer number (3818322).

Almost surely, 2^20216542 is an apocalyptic number.

20216542 is a deficient number, since it is larger than the sum of its proper divisors (10330034).

20216542 is a wasteful number, since it uses less digits than its factorization.

20216542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73922.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 20216542 is about 4496.2809075946. The cubic root of 20216542 is about 272.4178895777.

Adding to 20216542 its reverse (24561202), we get a palindrome (44777744).

The spelling of 20216542 in words is "twenty million, two hundred sixteen thousand, five hundred forty-two".