20681205750 has 48 divisors (see below), whose sum is σ = 55921986432. Its totient is φ = 5514987600.

The previous prime is 20681205733. The next prime is 20681205761. The reversal of 20681205750 is 5750218602.

It is a happy number.

20681205750 is a `hidden beast` number, since 2 + 0 + 6 + 81 + 2 + 0 + 575 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4593574 + ... + 4598073.

It is an arithmetic number, because the mean of its divisors is an integer number (1165041384).

Almost surely, 2^20681205750 is an apocalyptic number.

20681205750 is an abundant number, since it is smaller than the sum of its proper divisors (35240780682).

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

20681205750 is a wasteful number, since it uses less digits than its factorization.

20681205750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191670 (or 9191657 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 20681205750 in words is "twenty billion, six hundred eighty-one million, two hundred five thousand, seven hundred fifty".