20189566929 has 16 divisors (see below), whose sum is σ = 30777891840. Its totient is φ = 11532081360.

The previous prime is 20189566907. The next prime is 20189566933. The reversal of 20189566929 is 92966598102.

It is not a de Polignac number, because 20189566929 - 2⁵ = 20189566897 is a prime.

It is a super-2 number, since 2×20189566929² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20189561929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148749 + ... + 250010.

It is an arithmetic number, because the mean of its divisors is an integer number (1923618240).

Almost surely, 2^20189566929 is an apocalyptic number.

It is an amenable number.

20189566929 is a deficient number, since it is larger than the sum of its proper divisors (10588324911).

20189566929 is a wasteful number, since it uses less digits than its factorization.

20189566929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401180.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 20189566929 in words is "twenty billion, one hundred eighty-nine million, five hundred sixty-six thousand, nine hundred twenty-nine".