20351851683538 has 8 divisors (see below), whose sum is σ = 30842496881532. Its totient is φ = 10071019389696.

The previous prime is 20351851683511. The next prime is 20351851683551. The reversal of 20351851683538 is 83538615815302.

It can be written as a sum of positive squares in 2 ways, for example, as 20318881476609 + 32970206929 = 4507647^2 + 181577^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52453225795 + ... + 52453226182.

Almost surely, 2^{20351851683538} is an apocalyptic number.

20351851683538 is a deficient number, since it is larger than the sum of its proper divisors (10490645197994).

20351851683538 is a wasteful number, since it uses less digits than its factorization.

20351851683538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104906452076.

The product of its (nonzero) digits is 20736000, while the sum is 58.

The spelling of 20351851683538 in words is "twenty trillion, three hundred fifty-one billion, eight hundred fifty-one million, six hundred eighty-three thousand, five hundred thirty-eight".