20087751646 has 32 divisors (see below), whose sum is σ = 31026240000. Its totient is φ = 9750258336.

The previous prime is 20087751617. The next prime is 20087751647. The reversal of 20087751646 is 64615778002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20087751596 and 20087751605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20087751647) by changing a digit.

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, 4015855 + ... + 4020853.

It is an arithmetic number, because the mean of its divisors is an integer number (969570000).

Almost surely, 2^20087751646 is an apocalyptic number.

20087751646 is a deficient number, since it is larger than the sum of its proper divisors (10938488354).

20087751646 is a wasteful number, since it uses less digits than its factorization.

20087751646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 20087751646 in words is "twenty billion, eighty-seven million, seven hundred fifty-one thousand, six hundred forty-six".