20431152511 has 16 divisors (see below), whose sum is σ = 25476514560. Its totient is φ = 15917935680.

The previous prime is 20431152509. The next prime is 20431152541. The reversal of 20431152511 is 11525113402.

It is a cyclic number.

It is not a de Polignac number, because 20431152511 - 2¹ = 20431152509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431152541) 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 15 ways as a sum of consecutive naturals, for example, 611035 + ... + 643603.

It is an arithmetic number, because the mean of its divisors is an integer number (1592282160).

Almost surely, 2^20431152511 is an apocalyptic number.

20431152511 is a deficient number, since it is larger than the sum of its proper divisors (5045362049).

20431152511 is a wasteful number, since it uses less digits than its factorization.

20431152511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40734.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20431152511 its reverse (11525113402), we get a palindrome (31956265913).

The spelling of 20431152511 in words is "twenty billion, four hundred thirty-one million, one hundred fifty-two thousand, five hundred eleven".