20340442102 has 4 divisors (see below), whose sum is σ = 30510663156. Its totient is φ = 10170221050.

The previous prime is 20340442093. The next prime is 20340442121. The reversal of 20340442102 is 20124404302.

It is a happy number.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 5085110524 + ... + 5085110527.

It is an arithmetic number, because the mean of its divisors is an integer number (7627665789).

Almost surely, 2^20340442102 is an apocalyptic number.

20340442102 is a deficient number, since it is larger than the sum of its proper divisors (10170221054).

20340442102 is a wasteful number, since it uses less digits than its factorization.

20340442102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170221053.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20340442102 its reverse (20124404302), we get a palindrome (40464846404).

The spelling of 20340442102 in words is "twenty billion, three hundred forty million, four hundred forty-two thousand, one hundred two".