20285709161 has 8 divisors (see below), whose sum is σ = 20631825600. Its totient is φ = 19939669200.

The previous prime is 20285709131. The next prime is 20285709167. The reversal of 20285709161 is 16190758202.

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

It is a cyclic number.

It is not a de Polignac number, because 20285709161 - 2²² = 20281514857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20285709167) 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, 846695 + ... + 870323.

It is an arithmetic number, because the mean of its divisors is an integer number (2578978200).

Almost surely, 2^20285709161 is an apocalyptic number.

It is an amenable number.

20285709161 is a deficient number, since it is larger than the sum of its proper divisors (346116439).

20285709161 is a wasteful number, since it uses less digits than its factorization.

20285709161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38239.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 20285709161 in words is "twenty billion, two hundred eighty-five million, seven hundred nine thousand, one hundred sixty-one".