20715717129 has 8 divisors (see below), whose sum is σ = 27624628992. Its totient is φ = 13808641680.

The previous prime is 20715717097. The next prime is 20715717161. The reversal of 20715717129 is 92171751702.

It is an interprime number because it is at equal distance from previous prime (20715717097) and next prime (20715717161).

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

It is not a de Polignac number, because 20715717129 - 2⁵ = 20715717097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20715717329) 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, 432562 + ... + 478059.

It is an arithmetic number, because the mean of its divisors is an integer number (3453078624).

Almost surely, 2^20715717129 is an apocalyptic number.

It is an amenable number.

20715717129 is a deficient number, since it is larger than the sum of its proper divisors (6908911863).

20715717129 is an equidigital number, since it uses as much as digits as its factorization.

20715717129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918207.

The product of its (nonzero) digits is 61740, while the sum is 42.

The spelling of 20715717129 in words is "twenty billion, seven hundred fifteen million, seven hundred seventeen thousand, one hundred twenty-nine".