20201220031 has 2 divisors, whose sum is σ = 20201220032. Its totient is φ = 20201220030.

The previous prime is 20201219989. The next prime is 20201220041. The reversal of 20201220031 is 13002210202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20201220031 - 2¹⁵ = 20201187263 is a prime.

It is a super-2 number, since 2×20201220031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20201219993 and 20201220020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201220041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100610015 + 10100610016.

It is an arithmetic number, because the mean of its divisors is an integer number (10100610016).

Almost surely, 2^20201220031 is an apocalyptic number.

20201220031 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201220031 is an equidigital number, since it uses as much as digits as its factorization.

20201220031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20201220031 its reverse (13002210202), we get a palindrome (33203430233).

The spelling of 20201220031 in words is "twenty billion, two hundred one million, two hundred twenty thousand, thirty-one".