20648429638730 has 32 divisors (see below), whose sum is σ = 40033185508800. Its totient is φ = 7642699045632.

The previous prime is 20648429638693. The next prime is 20648429638747. The reversal of 20648429638730 is 3783692484602.

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, 1263665615 + ... + 1263681954.

It is an arithmetic number, because the mean of its divisors is an integer number (1251037047150).

Almost surely, 2^{20648429638730} is an apocalyptic number.

20648429638730 is a deficient number, since it is larger than the sum of its proper divisors (19384755870070).

20648429638730 is a wasteful number, since it uses less digits than its factorization.

20648429638730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527347638.

The product of its (nonzero) digits is 83607552, while the sum is 62.

The spelling of 20648429638730 in words is "twenty trillion, six hundred forty-eight billion, four hundred twenty-nine million, six hundred thirty-eight thousand, seven hundred thirty".