20618163 has 6 divisors (see below), whose sum is σ = 29781804. Its totient is φ = 13745436.

The previous prime is 20618141. The next prime is 20618197. The reversal of 20618163 is 36181602.

It is not a de Polignac number, because 20618163 - 2¹⁶ = 20552627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20618123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1145445 + ... + 1145462.

It is an arithmetic number, because the mean of its divisors is an integer number (4963634).

Almost surely, 2^20618163 is an apocalyptic number.

20618163 is a deficient number, since it is larger than the sum of its proper divisors (9163641).

20618163 is a wasteful number, since it uses less digits than its factorization.

20618163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290913 (or 2290910 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20618163 is about 4540.7227398290. The cubic root of 20618163 is about 274.2100215475.

Adding to 20618163 its reverse (36181602), we get a palindrome (56799765).

The spelling of 20618163 in words is "twenty million, six hundred eighteen thousand, one hundred sixty-three".