20523547066 has 64 divisors (see below), whose sum is σ = 34517975040. Its totient is φ = 9073944000.

The previous prime is 20523547049. The next prime is 20523547087. The reversal of 20523547066 is 66074532502.

It is an unprimeable number.

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, 75732511 + ... + 75732781.

It is an arithmetic number, because the mean of its divisors is an integer number (539343360).

Almost surely, 2^20523547066 is an apocalyptic number.

20523547066 is a deficient number, since it is larger than the sum of its proper divisors (13994427974).

20523547066 is a wasteful number, since it uses less digits than its factorization.

20523547066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 20523547066 in words is "twenty billion, five hundred twenty-three million, five hundred forty-seven thousand, sixty-six".