20523312345 has 32 divisors (see below), whose sum is σ = 33351702912. Its totient is φ = 10774881792.

The previous prime is 20523312307. The next prime is 20523312349. The reversal of 20523312345 is 54321332502.

It is not a de Polignac number, because 20523312345 - 2⁷ = 20523312217 is a prime.

It is a super-2 number, since 2×20523312345² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20523312349) 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 in 31 ways as a sum of consecutive naturals, for example, 554767 + ... + 590603.

It is an arithmetic number, because the mean of its divisors is an integer number (1042240716).

Almost surely, 2^20523312345 is an apocalyptic number.

It is an amenable number.

20523312345 is a deficient number, since it is larger than the sum of its proper divisors (12828390567).

20523312345 is a wasteful number, since it uses less digits than its factorization.

20523312345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36441.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 20523312345 its reverse (54321332502), we get a palindrome (74844644847).

The spelling of 20523312345 in words is "twenty billion, five hundred twenty-three million, three hundred twelve thousand, three hundred forty-five".