20751554916 has 135 divisors (see below), whose sum is σ = 55660129833. Its totient is φ = 6741727200.

The previous prime is 20751554909. The next prime is 20751554933. The reversal of 20751554916 is 61945515702.

It is a happy number.

The square root of 20751554916 is 144054.

It is a perfect power (a square), and thus also a powerful number.

20751554916 is a `hidden beast` number, since 2 + 0 + 7 + 5 + 1 + 554 + 91 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14959736100 + 5791818816 = 122310^2 + 76104^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 137427441 + ... + 137427591.

Almost surely, 2^20751554916 is an apocalyptic number.

20751554916 is the 144054-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20751554916

20751554916 is an abundant number, since it is smaller than the sum of its proper divisors (34908574917).

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

20751554916 is an equidigital number, since it uses as much as digits as its factorization.

20751554916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The spelling of 20751554916 in words is "twenty billion, seven hundred fifty-one million, five hundred fifty-four thousand, nine hundred sixteen".