20189138 has 8 divisors (see below), whose sum is σ = 31022460. Its totient is φ = 9848320.

The previous prime is 20189137. The next prime is 20189167. The reversal of 20189138 is 83198102.

It can be written as a sum of positive squares in 2 ways, for example, as 16056049 + 4133089 = 4007^2 + 2033^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20189137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123023 + ... + 123186.

Almost surely, 2^20189138 is an apocalyptic number.

20189138 is a deficient number, since it is larger than the sum of its proper divisors (10833322).

20189138 is a wasteful number, since it uses less digits than its factorization.

20189138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246252.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 20189138 is about 4493.2324667215. The cubic root of 20189138 is about 272.2947442918.

The spelling of 20189138 in words is "twenty million, one hundred eighty-nine thousand, one hundred thirty-eight".