20456751556 has 6 divisors (see below), whose sum is σ = 35799315230. Its totient is φ = 10228375776.

The previous prime is 20456751533. The next prime is 20456751589. The reversal of 20456751556 is 65515765402.

It can be written as a sum of positive squares in only one way, i.e., 20426126400 + 30625156 = 142920^2 + 5534^2 .

It is a super-4 number, since 4×20456751556⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557093941 + ... + 2557093948.

Almost surely, 2^20456751556 is an apocalyptic number.

It is an amenable number.

20456751556 is a deficient number, since it is larger than the sum of its proper divisors (15342563674).

20456751556 is a wasteful number, since it uses less digits than its factorization.

20456751556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114187893 (or 5114187891 counting only the distinct ones).

The product of its (nonzero) digits is 1260000, while the sum is 46.

The spelling of 20456751556 in words is "twenty billion, four hundred fifty-six million, seven hundred fifty-one thousand, five hundred fifty-six".