20647074161 has 24 divisors (see below), whose sum is σ = 24104169600. Its totient is φ = 17324701056.

The previous prime is 20647074139. The next prime is 20647074199. The reversal of 20647074161 is 16147074602.

It is a happy number.

It is not a de Polignac number, because 20647074161 - 2²⁶ = 20579965297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20647074061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11777261 + ... + 11779013.

It is an arithmetic number, because the mean of its divisors is an integer number (1004340400).

Almost surely, 2^20647074161 is an apocalyptic number.

It is an amenable number.

20647074161 is a deficient number, since it is larger than the sum of its proper divisors (3457095439).

20647074161 is an equidigital number, since it uses as much as digits as its factorization.

20647074161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 2412 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 20647074161 in words is "twenty billion, six hundred forty-seven million, seventy-four thousand, one hundred sixty-one".