20400012135 has 16 divisors (see below), whose sum is σ = 36266688480. Its totient is φ = 10880006400.

The previous prime is 20400012119. The next prime is 20400012151. The reversal of 20400012135 is 53121000402.

It is an interprime number because it is at equal distance from previous prime (20400012119) and next prime (20400012151).

It is not a de Polignac number, because 20400012135 - 2⁴ = 20400012119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75555466 + ... + 75555735.

It is an arithmetic number, because the mean of its divisors is an integer number (2266668030).

Almost surely, 2^20400012135 is an apocalyptic number.

20400012135 is a deficient number, since it is larger than the sum of its proper divisors (15866676345).

20400012135 is a wasteful number, since it uses less digits than its factorization.

20400012135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151111215 (or 151111209 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20400012135 its reverse (53121000402), we get a palindrome (73521012537).

The spelling of 20400012135 in words is "twenty billion, four hundred million, twelve thousand, one hundred thirty-five".