20995720201 has 3 divisors (see below), whose sum is σ = 20995865101. Its totient is φ = 20995575302.

The previous prime is 20995720181. The next prime is 20995720219. The reversal of 20995720201 is 10202759902.

The square root of 20995720201 is 144899.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10202759902 = 2 ⋅5101379951.

It is not a de Polignac number, because 20995720201 - 2⁵ = 20995720169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20995720301) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 72450 + ... + 217348.

Almost surely, 2^20995720201 is an apocalyptic number.

20995720201 is the 144899-th square number.

20995720201 is the 72450-th centered octagonal number.

It is an amenable number.

20995720201 is a deficient number, since it is larger than the sum of its proper divisors (144900).

20995720201 is an frugal number, since it uses more digits than its factorization.

20995720201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289798 (or 144899 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 20995720201 in words is "twenty billion, nine hundred ninety-five million, seven hundred twenty thousand, two hundred one".