20397607009642 has 8 divisors (see below), whose sum is σ = 30625577734500. Its totient is φ = 10189081098144.

The previous prime is 20397607009589. The next prime is 20397607009649. The reversal of 20397607009642 is 24690070679302.

It is a happy number.

It is a Cunningham number, because it is equal to 4516371²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 20397607009641 + 1 = 4516371^2 + 1^2 .

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 (20397607009649) 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, 4861200717 + ... + 4861204912.

Almost surely, 2^{20397607009642} is an apocalyptic number.

20397607009642 is a deficient number, since it is larger than the sum of its proper divisors (10227970724858).

20397607009642 is a wasteful number, since it uses less digits than its factorization.

20397607009642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9722406680.

The product of its (nonzero) digits is 6858432, while the sum is 55.

The spelling of 20397607009642 in words is "twenty trillion, three hundred ninety-seven billion, six hundred seven million, nine thousand, six hundred forty-two".