20531023011 has 12 divisors (see below), whose sum is σ = 29661993192. Its totient is φ = 13684546656.

The previous prime is 20531023003. The next prime is 20531023033. The reversal of 20531023011 is 11032013502.

It is not a de Polignac number, because 20531023011 - 2³ = 20531023003 is a prime.

It is a super-2 number, since 2×20531023011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20531023001) 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 11 ways as a sum of consecutive naturals, for example, 186601 + ... + 275466.

It is an arithmetic number, because the mean of its divisors is an integer number (2471832766).

Almost surely, 2^20531023011 is an apocalyptic number.

20531023011 is a deficient number, since it is larger than the sum of its proper divisors (9130970181).

20531023011 is a wasteful number, since it uses less digits than its factorization.

20531023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467010 (or 467007 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 20531023011 its reverse (11032013502), we get a palindrome (31563036513).

The spelling of 20531023011 in words is "twenty billion, five hundred thirty-one million, twenty-three thousand, eleven".