20512435005 has 32 divisors (see below), whose sum is σ = 37724025600. Its totient is φ = 10562723136.

The previous prime is 20512435003. The next prime is 20512435007. The reversal of 20512435005 is 50053421502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20512435003) and next prime (20512435007).

It is not a de Polignac number, because 20512435005 - 2¹ = 20512435003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20512435005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20512435003) 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 31 ways as a sum of consecutive naturals, for example, 2615809 + ... + 2623638.

It is an arithmetic number, because the mean of its divisors is an integer number (1178875800).

Almost surely, 2^20512435005 is an apocalyptic number.

It is an amenable number.

20512435005 is a deficient number, since it is larger than the sum of its proper divisors (17211590595).

20512435005 is a wasteful number, since it uses less digits than its factorization.

20512435005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239490 (or 5239484 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 20512435005 its reverse (50053421502), we get a palindrome (70565856507).

The spelling of 20512435005 in words is "twenty billion, five hundred twelve million, four hundred thirty-five thousand, five".