20638568334 has 32 divisors (see below), whose sum is σ = 43209494784. Its totient is φ = 6559375680.

The previous prime is 20638568329. The next prime is 20638568369. The reversal of 20638568334 is 43386583602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195712 + ... + 282099.

It is an arithmetic number, because the mean of its divisors is an integer number (1350296712).

Almost surely, 2^20638568334 is an apocalyptic number.

20638568334 is an abundant number, since it is smaller than the sum of its proper divisors (22570926450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20638568334 is a wasteful number, since it uses less digits than its factorization.

20638568334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478152.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 20638568334 in words is "twenty billion, six hundred thirty-eight million, five hundred sixty-eight thousand, three hundred thirty-four".