20554206645 has 48 divisors (see below), whose sum is σ = 38316552768. Its totient is φ = 9381335040.

The previous prime is 20554206637. The next prime is 20554206679. The reversal of 20554206645 is 54660245502.

It is not a de Polignac number, because 20554206645 - 2³ = 20554206637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 449322 + ... + 492948.

It is an arithmetic number, because the mean of its divisors is an integer number (798261516).

Almost surely, 2^20554206645 is an apocalyptic number.

It is an amenable number.

20554206645 is a deficient number, since it is larger than the sum of its proper divisors (17762346123).

20554206645 is a wasteful number, since it uses less digits than its factorization.

20554206645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44290 (or 44283 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 20554206645 in words is "twenty billion, five hundred fifty-four million, two hundred six thousand, six hundred forty-five".