20189697 has 12 divisors (see below), whose sum is σ = 29589840. Its totient is φ = 12235960.

The previous prime is 20189681. The next prime is 20189707. The reversal of 20189697 is 79698102.

It is not a de Polignac number, because 20189697 - 2⁴ = 20189681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20189627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27447 + ... + 28172.

It is an arithmetic number, because the mean of its divisors is an integer number (2465820).

Almost surely, 2^20189697 is an apocalyptic number.

It is an amenable number.

20189697 is a deficient number, since it is larger than the sum of its proper divisors (9400143).

20189697 is a wasteful number, since it uses less digits than its factorization.

20189697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55644 (or 55633 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 20189697 is about 4493.2946709514. The cubic root of 20189697 is about 272.2972573817.

It can be divided in two parts, 201 and 89697, that added together give a palindrome (89898).

The spelling of 20189697 in words is "twenty million, one hundred eighty-nine thousand, six hundred ninety-seven".