20123201 has 4 divisors (see below), whose sum is σ = 22997952. Its totient is φ = 17248452.

The previous prime is 20123179. The next prime is 20123231. The reversal of 20123201 is 10232102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123231) 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, 1437365 + ... + 1437378.

It is an arithmetic number, because the mean of its divisors is an integer number (5749488).

Almost surely, 2^20123201 is an apocalyptic number.

It is an amenable number.

20123201 is a deficient number, since it is larger than the sum of its proper divisors (2874751).

20123201 is an equidigital number, since it uses as much as digits as its factorization.

20123201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874750.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20123201 is about 4485.8890980496. The cubic root of 20123201 is about 271.9979860361.

Adding to 20123201 its reverse (10232102), we get a palindrome (30355303).

The spelling of 20123201 in words is "twenty million, one hundred twenty-three thousand, two hundred one".