20171129 has 8 divisors (see below), whose sum is σ = 23299488. Its totient is φ = 17258560.

The previous prime is 20171101. The next prime is 20171147. The reversal of 20171129 is 92117102.

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

It is not a de Polignac number, because 20171129 - 2⁸ = 20170873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20171189) 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, 53747 + ... + 54120.

It is an arithmetic number, because the mean of its divisors is an integer number (2912436).

Almost surely, 2^20171129 is an apocalyptic number.

It is an amenable number.

20171129 is a deficient number, since it is larger than the sum of its proper divisors (3128359).

20171129 is a wasteful number, since it uses less digits than its factorization.

20171129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107895.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 20171129 is about 4491.2280057908. The cubic root of 20171129 is about 272.2137566035.

The spelling of 20171129 in words is "twenty million, one hundred seventy-one thousand, one hundred twenty-nine".