20342539678 has 4 divisors (see below), whose sum is σ = 30513809520. Its totient is φ = 10171269838.

The previous prime is 20342539663. The next prime is 20342539697. The reversal of 20342539678 is 87693524302.

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

It is a Smith number, since the sum of its digits (49) 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, 5085634918 + ... + 5085634921.

It is an arithmetic number, because the mean of its divisors is an integer number (7628452380).

Almost surely, 2^20342539678 is an apocalyptic number.

20342539678 is a deficient number, since it is larger than the sum of its proper divisors (10171269842).

20342539678 is a wasteful number, since it uses less digits than its factorization.

20342539678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171269841.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 20342539678 in words is "twenty billion, three hundred forty-two million, five hundred thirty-nine thousand, six hundred seventy-eight".