20404204134 has 64 divisors (see below), whose sum is σ = 44827784640. Its totient is φ = 6162759680.

The previous prime is 20404204133. The next prime is 20404204157. The reversal of 20404204134 is 43140240402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404204133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1034404 + ... + 1053944.

It is an arithmetic number, because the mean of its divisors is an integer number (700434135).

Almost surely, 2^20404204134 is an apocalyptic number.

20404204134 is an abundant number, since it is smaller than the sum of its proper divisors (24423580506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20404204134 is a wasteful number, since it uses less digits than its factorization.

20404204134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19945.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 20404204134 its reverse (43140240402), we get a palindrome (63544444536).

The spelling of 20404204134 in words is "twenty billion, four hundred four million, two hundred four thousand, one hundred thirty-four".