20320643654642 has 16 divisors (see below), whose sum is σ = 31996681299072. Its totient is φ = 9660373678560.

The previous prime is 20320643654639. The next prime is 20320643654737. The reversal of 20320643654642 is 24645634602302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1322606459 + ... + 1322621822.

It is an arithmetic number, because the mean of its divisors is an integer number (1999792581192).

Almost surely, 2^{20320643654642} is an apocalyptic number.

20320643654642 is a deficient number, since it is larger than the sum of its proper divisors (11676037644430).

20320643654642 is a wasteful number, since it uses less digits than its factorization.

20320643654642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645228473.

The product of its (nonzero) digits is 4976640, while the sum is 47.

The spelling of 20320643654642 in words is "twenty trillion, three hundred twenty billion, six hundred forty-three million, six hundred fifty-four thousand, six hundred forty-two".