20346640654642 has 8 divisors (see below), whose sum is σ = 31264350274332. Its totient is φ = 9925190563200.

The previous prime is 20346640654579. The next prime is 20346640654657. The reversal of 20346640654642 is 24645604664302.

It can be written as a sum of positive squares in 2 ways, for example, as 15473279764881 + 4873360889761 = 3933609^2 + 2207569^2 .

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

It is a super-2 number, since 2×20346640654642² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20346640654642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124064881959 + ... + 124064882122.

Almost surely, 2^{20346640654642} is an apocalyptic number.

20346640654642 is a deficient number, since it is larger than the sum of its proper divisors (10917709619690).

20346640654642 is a wasteful number, since it uses less digits than its factorization.

20346640654642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248129764124.

The product of its (nonzero) digits is 19906560, while the sum is 52.

The spelling of 20346640654642 in words is "twenty trillion, three hundred forty-six billion, six hundred forty million, six hundred fifty-four thousand, six hundred forty-two".