20400134211 has 24 divisors (see below), whose sum is σ = 30766993920. Its totient is φ = 13000757616.

The previous prime is 20400134207. The next prime is 20400134243. The reversal of 20400134211 is 11243100402.

20400134211 is a `hidden beast` number, since 20 + 400 + 1 + 34 + 211 = 666.

It is not a de Polignac number, because 20400134211 - 2² = 20400134207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20400134201) 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 23 ways as a sum of consecutive naturals, for example, 315510 + ... + 374628.

It is an arithmetic number, because the mean of its divisors is an integer number (1281958080).

Almost surely, 2^20400134211 is an apocalyptic number.

20400134211 is a deficient number, since it is larger than the sum of its proper divisors (10366859709).

20400134211 is a wasteful number, since it uses less digits than its factorization.

20400134211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60815 (or 60812 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 20400134211 its reverse (11243100402), we get a palindrome (31643234613).

The spelling of 20400134211 in words is "twenty billion, four hundred million, one hundred thirty-four thousand, two hundred eleven".