20549476931 has 8 divisors (see below), whose sum is σ = 20888965104. Its totient is φ = 20210073120.

The previous prime is 20549476907. The next prime is 20549476939. The reversal of 20549476931 is 13967494502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20549476931 - 2¹⁰ = 20549475907 is a prime.

It is a super-2 number, since 2×20549476931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20549476931.

It is not an unprimeable number, because it can be changed into a prime (20549476939) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 639020 + ... + 670406.

It is an arithmetic number, because the mean of its divisors is an integer number (2611120638).

Almost surely, 2^20549476931 is an apocalyptic number.

20549476931 is a deficient number, since it is larger than the sum of its proper divisors (339488173).

20549476931 is a wasteful number, since it uses less digits than its factorization.

20549476931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42181.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 20549476931 in words is "twenty billion, five hundred forty-nine million, four hundred seventy-six thousand, nine hundred thirty-one".