20657427569 has 8 divisors (see below), whose sum is σ = 21013440000. Its totient is φ = 20301611472.

The previous prime is 20657427563. The next prime is 20657427611. The reversal of 20657427569 is 96572475602.

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-20657427569 is a prime.

It is a super-2 number, since 2×20657427569² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20657427569.

It is not an unprimeable number, because it can be changed into a prime (20657427563) 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, 171632 + ... + 266030.

It is an arithmetic number, because the mean of its divisors is an integer number (2626680000).

Almost surely, 2^20657427569 is an apocalyptic number.

It is an amenable number.

20657427569 is a deficient number, since it is larger than the sum of its proper divisors (356012431).

20657427569 is an equidigital number, since it uses as much as digits as its factorization.

20657427569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98167.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 20657427569 in words is "twenty billion, six hundred fifty-seven million, four hundred twenty-seven thousand, five hundred sixty-nine".