20288181 has 8 divisors (see below), whose sum is σ = 28474720. Its totient is φ = 12813552.

The previous prime is 20288171. The next prime is 20288183. The reversal of 20288181 is 18188202.

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

It is not a de Polignac number, because 20288181 - 2⁷ = 20288053 is a prime.

It is a super-2 number, since 2×20288181² = 823220576577522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288183) 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, 177910 + ... + 178023.

It is an arithmetic number, because the mean of its divisors is an integer number (3559340).

Almost surely, 2^20288181 is an apocalyptic number.

It is an amenable number.

20288181 is a deficient number, since it is larger than the sum of its proper divisors (8186539).

20288181 is a wasteful number, since it uses less digits than its factorization.

20288181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355955.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 20288181 is about 4504.2403355061. The cubic root of 20288181 is about 272.7392887332.

The spelling of 20288181 in words is "twenty million, two hundred eighty-eight thousand, one hundred eighty-one".