20556550147 has 16 divisors (see below), whose sum is σ = 23628386304. Its totient is φ = 17518608000.

The previous prime is 20556550117. The next prime is 20556550159. The reversal of 20556550147 is 74105565502.

It is a cyclic number.

It is not a de Polignac number, because 20556550147 - 2²³ = 20548161539 is a prime.

It is a super-2 number, since 2×20556550147² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20556550117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4504747 + ... + 4509307.

It is an arithmetic number, because the mean of its divisors is an integer number (1476774144).

Almost surely, 2^20556550147 is an apocalyptic number.

20556550147 is a deficient number, since it is larger than the sum of its proper divisors (3071836157).

20556550147 is a wasteful number, since it uses less digits than its factorization.

20556550147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130.

The product of its (nonzero) digits is 210000, while the sum is 40.

The spelling of 20556550147 in words is "twenty billion, five hundred fifty-six million, five hundred fifty thousand, one hundred forty-seven".