20602181 has 8 divisors (see below), whose sum is σ = 22762944. Its totient is φ = 18546880.

The previous prime is 20602157. The next prime is 20602189. The reversal of 20602181 is 18120602.

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

It is a cyclic number.

It is not a de Polignac number, because 20602181 - 2¹⁰ = 20601157 is a prime.

It is a super-4 number, since 4×20602181⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602189) 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 7 ways as a sum of consecutive naturals, for example, 25955 + ... + 26736.

It is an arithmetic number, because the mean of its divisors is an integer number (2845368).

Almost surely, 2^20602181 is an apocalyptic number.

It is an amenable number.

20602181 is a deficient number, since it is larger than the sum of its proper divisors (2160763).

20602181 is a wasteful number, since it uses less digits than its factorization.

20602181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52731.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20602181 is about 4538.9625466620. The cubic root of 20602181 is about 274.1391526832.

Adding to 20602181 its reverse (18120602), we get a palindrome (38722783).

The spelling of 20602181 in words is "twenty million, six hundred two thousand, one hundred eighty-one".