20021232031 has 4 divisors (see below), whose sum is σ = 20021515864. Its totient is φ = 20020948200.

The previous prime is 20021232017. The next prime is 20021232157. The reversal of 20021232031 is 13023212002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20021232031 - 2⁹ = 20021231519 is a prime.

It is a super-2 number, since 2×20021232031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021231996 and 20021232014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021232001) 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 in 3 ways as a sum of consecutive naturals, for example, 54601 + ... + 207421.

It is an arithmetic number, because the mean of its divisors is an integer number (5005378966).

Almost surely, 2^20021232031 is an apocalyptic number.

20021232031 is a deficient number, since it is larger than the sum of its proper divisors (283833).

20021232031 is a wasteful number, since it uses less digits than its factorization.

20021232031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283832.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20021232031 its reverse (13023212002), we get a palindrome (33044444033).

The spelling of 20021232031 in words is "twenty billion, twenty-one million, two hundred thirty-two thousand, thirty-one".