20201220231 has 16 divisors (see below), whose sum is σ = 27072328704. Its totient is φ = 13398969024.

The previous prime is 20201220209. The next prime is 20201220239. The reversal of 20201220231 is 13202210202.

It is a happy number.

It is not a de Polignac number, because 20201220231 - 2¹³ = 20201212039 is a prime.

It is a super-2 number, since 2×20201220231² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20201220231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201220239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454506 + ... + 496968.

It is an arithmetic number, because the mean of its divisors is an integer number (1692020544).

Almost surely, 2^20201220231 is an apocalyptic number.

20201220231 is a deficient number, since it is larger than the sum of its proper divisors (6871108473).

20201220231 is a wasteful number, since it uses less digits than its factorization.

20201220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43270.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20201220231 its reverse (13202210202), we get a palindrome (33403430433).

The spelling of 20201220231 in words is "twenty billion, two hundred one million, two hundred twenty thousand, two hundred thirty-one".