20671208569 has 8 divisors (see below), whose sum is σ = 22575173760. Its totient is φ = 18771370800.

The previous prime is 20671208563. The next prime is 20671208627. The reversal of 20671208569 is 96580217602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20671208569 is a prime.

It is a super-2 number, since 2×20671208569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20671208563) 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, 1021374 + ... + 1041415.

It is an arithmetic number, because the mean of its divisors is an integer number (2821896720).

Almost surely, 2^20671208569 is an apocalyptic number.

It is an amenable number.

20671208569 is a deficient number, since it is larger than the sum of its proper divisors (1903965191).

20671208569 is a wasteful number, since it uses less digits than its factorization.

20671208569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063711.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 20671208569 in words is "twenty billion, six hundred seventy-one million, two hundred eight thousand, five hundred sixty-nine".