20400243134 has 16 divisors (see below), whose sum is σ = 32423457600. Its totient is φ = 9593278464.

The previous prime is 20400243131. The next prime is 20400243161. The reversal of 20400243134 is 43134200402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400243131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165014 + ... + 260825.

It is an arithmetic number, because the mean of its divisors is an integer number (2026466100).

Almost surely, 2^20400243134 is an apocalyptic number.

20400243134 is a deficient number, since it is larger than the sum of its proper divisors (12023214466).

20400243134 is a wasteful number, since it uses less digits than its factorization.

20400243134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427267.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 20400243134 its reverse (43134200402), we get a palindrome (63534443536).

The spelling of 20400243134 in words is "twenty billion, four hundred million, two hundred forty-three thousand, one hundred thirty-four".