20402134443 has 42 divisors (see below), whose sum is σ = 31439825844. Its totient is φ = 13233169584.

The previous prime is 20402134421. The next prime is 20402134453. The reversal of 20402134443 is 34443120402.

It is a happy number.

20402134443 is a `hidden beast` number, since 2 + 0 + 4 + 0 + 213 + 4 + 443 = 666.

It is not a de Polignac number, because 20402134443 - 2⁹ = 20402133931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20402134453) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 987780 + ... + 1008222.

It is an arithmetic number, because the mean of its divisors is an integer number (748567282).

Almost surely, 2^20402134443 is an apocalyptic number.

20402134443 is a deficient number, since it is larger than the sum of its proper divisors (11037691401).

20402134443 is an frugal number, since it uses more digits than its factorization.

20402134443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535 (or 20483 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20402134443 its reverse (34443120402), we get a palindrome (54845254845).

The spelling of 20402134443 in words is "twenty billion, four hundred two million, one hundred thirty-four thousand, four hundred forty-three".