20621134756 has 12 divisors (see below), whose sum is σ = 36854794368. Its totient is φ = 10091193512.

The previous prime is 20621134753. The next prime is 20621134757. The reversal of 20621134756 is 65743112602.

It is a super-2 number, since 2×20621134756² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20621134753) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 54843256 + ... + 54843631.

It is an arithmetic number, because the mean of its divisors is an integer number (3071232864).

Almost surely, 2^20621134756 is an apocalyptic number.

It is an amenable number.

20621134756 is a deficient number, since it is larger than the sum of its proper divisors (16233659612).

20621134756 is a wasteful number, since it uses less digits than its factorization.

20621134756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109686938 (or 109686936 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The spelling of 20621134756 in words is "twenty billion, six hundred twenty-one million, one hundred thirty-four thousand, seven hundred fifty-six".