20221187 has 8 divisors (see below), whose sum is σ = 24326400. Its totient is φ = 16420104.

The previous prime is 20221183. The next prime is 20221193. The reversal of 20221187 is 78112202.

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

It is not a de Polignac number, because 20221187 - 2² = 20221183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20221183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75887 + ... + 76152.

It is an arithmetic number, because the mean of its divisors is an integer number (3040800).

Almost surely, 2^20221187 is an apocalyptic number.

20221187 is a deficient number, since it is larger than the sum of its proper divisors (4105213).

20221187 is a wasteful number, since it uses less digits than its factorization.

20221187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152065.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20221187 is about 4496.7974159395. The cubic root of 20221187 is about 272.4387517706.

Adding to 20221187 its reverse (78112202), we get a palindrome (98333389).

The spelling of 20221187 in words is "twenty million, two hundred twenty-one thousand, one hundred eighty-seven".