20531154223 has 2 divisors, whose sum is σ = 20531154224. Its totient is φ = 20531154222.

The previous prime is 20531154221. The next prime is 20531154233. The reversal of 20531154223 is 32245113502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531154223 - 2¹ = 20531154221 is a prime.

It is a super-2 number, since 2×20531154223² (a number of 21 digits) contains 22 as substring.

Together with 20531154221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20531154191 and 20531154200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20531154221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265577111 + 10265577112.

It is an arithmetic number, because the mean of its divisors is an integer number (10265577112).

Almost surely, 2^20531154223 is an apocalyptic number.

20531154223 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531154223 is an equidigital number, since it uses as much as digits as its factorization.

20531154223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20531154223 its reverse (32245113502), we get a palindrome (52776267725).

The spelling of 20531154223 in words is "twenty billion, five hundred thirty-one million, one hundred fifty-four thousand, two hundred twenty-three".