20340723542 has 4 divisors (see below), whose sum is σ = 30511085316. Its totient is φ = 10170361770.

The previous prime is 20340723517. The next prime is 20340723553. The reversal of 20340723542 is 24532704302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24532704302 = 2 ⋅12266352151.

It is a junction number, because it is equal to n+sod(n) for n = 20340723499 and 20340723508.

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, 5085180884 + ... + 5085180887.

It is an arithmetic number, because the mean of its divisors is an integer number (7627771329).

Almost surely, 2^20340723542 is an apocalyptic number.

20340723542 is a deficient number, since it is larger than the sum of its proper divisors (10170361774).

20340723542 is a wasteful number, since it uses less digits than its factorization.

20340723542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170361773.

The product of its (nonzero) digits is 40320, while the sum is 32.

The spelling of 20340723542 in words is "twenty billion, three hundred forty million, seven hundred twenty-three thousand, five hundred forty-two".