20400432011 has 2 divisors, whose sum is σ = 20400432012. Its totient is φ = 20400432010.

The previous prime is 20400432007. The next prime is 20400432023. The reversal of 20400432011 is 11023400402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400432011 - 2² = 20400432007 is a prime.

It is not a weakly prime, because it can be changed into another prime (20400432071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200216005 + 10200216006.

It is an arithmetic number, because the mean of its divisors is an integer number (10200216006).

Almost surely, 2^20400432011 is an apocalyptic number.

20400432011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400432011 is an equidigital number, since it uses as much as digits as its factorization.

20400432011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20400432011 its reverse (11023400402), we get a palindrome (31423832413).

The spelling of 20400432011 in words is "twenty billion, four hundred million, four hundred thirty-two thousand, eleven".