20858310161 has 8 divisors (see below), whose sum is σ = 22514678760. Its totient is φ = 19209353472.

The previous prime is 20858310131. The next prime is 20858310169. The reversal of 20858310161 is 16101385802.

It can be written as a sum of positive squares in 4 ways, for example, as 966028561 + 19892281600 = 31081^2 + 141040^2 .

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-20858310161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20858310169) 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, 1847126 + ... + 1858383.

It is an arithmetic number, because the mean of its divisors is an integer number (2814334845).

Almost surely, 2^20858310161 is an apocalyptic number.

It is an amenable number.

20858310161 is a deficient number, since it is larger than the sum of its proper divisors (1656368599).

20858310161 is a wasteful number, since it uses less digits than its factorization.

20858310161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3705955.

The product of its (nonzero) digits is 11520, while the sum is 35.

Adding to 20858310161 its reverse (16101385802), we get a palindrome (36959695963).

The spelling of 20858310161 in words is "twenty billion, eight hundred fifty-eight million, three hundred ten thousand, one hundred sixty-one".