20601571971 has 8 divisors (see below), whose sum is σ = 27481958080. Its totient is φ = 13727783592.

The previous prime is 20601571961. The next prime is 20601571979. The reversal of 20601571971 is 17917510602.

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

It is not a de Polignac number, because 20601571971 - 2²⁶ = 20534463107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20601571979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1642141 + ... + 1654638.

It is an arithmetic number, because the mean of its divisors is an integer number (3435244760).

Almost surely, 2^20601571971 is an apocalyptic number.

20601571971 is a deficient number, since it is larger than the sum of its proper divisors (6880386109).

20601571971 is a wasteful number, since it uses less digits than its factorization.

20601571971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298865.

The product of its (nonzero) digits is 26460, while the sum is 39.

The spelling of 20601571971 in words is "twenty billion, six hundred one million, five hundred seventy-one thousand, nine hundred seventy-one".