20105402343134 has 4 divisors (see below), whose sum is σ = 30158103514704. Its totient is φ = 10052701171566.

The previous prime is 20105402343097. The next prime is 20105402343157. The reversal of 20105402343134 is 43134320450102.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20105402343134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026350585782 + ... + 5026350585785.

It is an arithmetic number, because the mean of its divisors is an integer number (7539525878676).

Almost surely, 2^{20105402343134} is an apocalyptic number.

20105402343134 is a deficient number, since it is larger than the sum of its proper divisors (10052701171570).

20105402343134 is a wasteful number, since it uses less digits than its factorization.

20105402343134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052701171569.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 20105402343134 its reverse (43134320450102), we get a palindrome (63239722793236).

The spelling of 20105402343134 in words is "twenty trillion, one hundred five billion, four hundred two million, three hundred forty-three thousand, one hundred thirty-four".