20112201 has 12 divisors (see below), whose sum is σ = 29836612. Its totient is φ = 13045536.

The previous prime is 20112199. The next prime is 20112217. The reversal of 20112201 is 10221102.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 8415801 = 3420^2 + 2901^2 .

It is not a de Polignac number, because 20112201 - 2¹ = 20112199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29866 + ... + 30531.

Almost surely, 2^20112201 is an apocalyptic number.

It is an amenable number.

20112201 is a deficient number, since it is larger than the sum of its proper divisors (9724411).

20112201 is a wasteful number, since it uses less digits than its factorization.

20112201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60440 (or 60437 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 20112201 is about 4484.6628635829. The cubic root of 20112201 is about 271.9484160036.

Adding to 20112201 its reverse (10221102), we get a palindrome (30333303).

The spelling of 20112201 in words is "twenty million, one hundred twelve thousand, two hundred one".