20612271340642 has 4 divisors (see below), whose sum is σ = 30918407010966. Its totient is φ = 10306135670320.

The previous prime is 20612271340613. The next prime is 20612271340657. The reversal of 20612271340642 is 24604317221602.

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

It can be written as a sum of positive squares in only one way, i.e., 15606442349001 + 5005828991641 = 3950499^2 + 2237371^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 20612271340595 and 20612271340604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153067835159 + ... + 5153067835162.

Almost surely, 2^{20612271340642} is an apocalyptic number.

20612271340642 is a deficient number, since it is larger than the sum of its proper divisors (10306135670324).

20612271340642 is a wasteful number, since it uses less digits than its factorization.

20612271340642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306135670323.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 20612271340642 in words is "twenty trillion, six hundred twelve billion, two hundred seventy-one million, three hundred forty thousand, six hundred forty-two".