20402220131 has 2 divisors, whose sum is σ = 20402220132. Its totient is φ = 20402220130.

The previous prime is 20402220089. The next prime is 20402220133. The reversal of 20402220131 is 13102220402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20402220131 - 2¹⁴ = 20402203747 is a prime.

It is a super-2 number, since 2×20402220131² (a number of 21 digits) contains 22 as substring.

Together with 20402220133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20402220133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201110065 + 10201110066.

It is an arithmetic number, because the mean of its divisors is an integer number (10201110066).

Almost surely, 2^20402220131 is an apocalyptic number.

20402220131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402220131 is an equidigital number, since it uses as much as digits as its factorization.

20402220131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20402220131 its reverse (13102220402), we get a palindrome (33504440533).

The spelling of 20402220131 in words is "twenty billion, four hundred two million, two hundred twenty thousand, one hundred thirty-one".