20205220231 has 16 divisors (see below), whose sum is σ = 23232489280. Its totient is φ = 17213264640.

The previous prime is 20205220229. The next prime is 20205220253. The reversal of 20205220231 is 13202250202.

It is a cyclic number.

It is not a de Polignac number, because 20205220231 - 2¹ = 20205220229 is a prime.

It is a super-2 number, since 2×20205220231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20205220199 and 20205220208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205224231) 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, 3008305 + ... + 3015013.

It is an arithmetic number, because the mean of its divisors is an integer number (1452030580).

Almost surely, 2^20205220231 is an apocalyptic number.

20205220231 is a deficient number, since it is larger than the sum of its proper divisors (3027269049).

20205220231 is a wasteful number, since it uses less digits than its factorization.

20205220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9274.

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 20205220231 its reverse (13202250202), we get a palindrome (33407470433).

The spelling of 20205220231 in words is "twenty billion, two hundred five million, two hundred twenty thousand, two hundred thirty-one".