20610172201 has 4 divisors (see below), whose sum is σ = 20716960852. Its totient is φ = 20503383552.

The previous prime is 20610172199. The next prime is 20610172217. The reversal of 20610172201 is 10227101602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6095705625 + 14514466576 = 78075^2 + 120476^2 .

It is a cyclic number.

It is not a de Polignac number, because 20610172201 - 2¹ = 20610172199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20610172001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53394036 + ... + 53394421.

It is an arithmetic number, because the mean of its divisors is an integer number (5179240213).

Almost surely, 2^20610172201 is an apocalyptic number.

It is an amenable number.

20610172201 is a deficient number, since it is larger than the sum of its proper divisors (106788651).

20610172201 is a wasteful number, since it uses less digits than its factorization.

20610172201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106788650.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 20610172201 its reverse (10227101602), we get a palindrome (30837273803).

The spelling of 20610172201 in words is "twenty billion, six hundred ten million, one hundred seventy-two thousand, two hundred one".