20555933645 has 32 divisors (see below), whose sum is σ = 27057421440. Its totient is φ = 14898965760.

The previous prime is 20555933611. The next prime is 20555933647. The reversal of 20555933645 is 54633955502.

It is a de Polignac number, because none of the positive numbers 2^k-20555933645 is a prime.

It is a super-3 number, since 3×20555933645³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20555933645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555933647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2646107 + ... + 2653863.

It is an arithmetic number, because the mean of its divisors is an integer number (845544420).

Almost surely, 2^20555933645 is an apocalyptic number.

It is an amenable number.

20555933645 is a deficient number, since it is larger than the sum of its proper divisors (6501487795).

20555933645 is a wasteful number, since it uses less digits than its factorization.

20555933645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8525.

The product of its (nonzero) digits is 2430000, while the sum is 47.

The spelling of 20555933645 in words is "twenty billion, five hundred fifty-five million, nine hundred thirty-three thousand, six hundred forty-five".