20395378642 has 8 divisors (see below), whose sum is σ = 30895969932. Its totient is φ = 10096722000.

The previous prime is 20395378583. The next prime is 20395378643. The reversal of 20395378642 is 24687359302.

It can be written as a sum of positive squares in 2 ways, for example, as 19706263641 + 689115001 = 140379^2 + 26251^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20395378643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50483409 + ... + 50483812.

Almost surely, 2^20395378642 is an apocalyptic number.

20395378642 is a deficient number, since it is larger than the sum of its proper divisors (10500591290).

20395378642 is a wasteful number, since it uses less digits than its factorization.

20395378642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100967324.

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

The spelling of 20395378642 in words is "twenty billion, three hundred ninety-five million, three hundred seventy-eight thousand, six hundred forty-two".