20523012243 has 16 divisors (see below), whose sum is σ = 28393107456. Its totient is φ = 13172037120.

The previous prime is 20523012229. The next prime is 20523012253. The reversal of 20523012243 is 34221032502.

It is not a de Polignac number, because 20523012243 - 2¹² = 20523008147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20523012253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 553755 + ... + 589652.

It is an arithmetic number, because the mean of its divisors is an integer number (1774569216).

Almost surely, 2^20523012243 is an apocalyptic number.

20523012243 is a deficient number, since it is larger than the sum of its proper divisors (7870095213).

20523012243 is a wasteful number, since it uses less digits than its factorization.

20523012243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143634.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 20523012243 its reverse (34221032502), we get a palindrome (54744044745).

The spelling of 20523012243 in words is "twenty billion, five hundred twenty-three million, twelve thousand, two hundred forty-three".