20505505546 has 16 divisors (see below), whose sum is σ = 33130072800. Its totient is φ = 9487246608.

The previous prime is 20505505541. The next prime is 20505505567. The reversal of 20505505546 is 64550550502.

It is not an unprimeable number, because it can be changed into a prime (20505505541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6273001 + ... + 6276268.

It is an arithmetic number, because the mean of its divisors is an integer number (2070629550).

Almost surely, 2^20505505546 is an apocalyptic number.

20505505546 is a deficient number, since it is larger than the sum of its proper divisors (12624567254).

20505505546 is a wasteful number, since it uses less digits than its factorization.

20505505546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12549333.

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 20505505546 in words is "twenty billion, five hundred five million, five hundred five thousand, five hundred forty-six".