20428506066 has 32 divisors (see below), whose sum is σ = 41003633088. Its totient is φ = 6785095680.

The previous prime is 20428506029. The next prime is 20428506107. The reversal of 20428506066 is 66060582402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3697386 + ... + 3702906.

It is an arithmetic number, because the mean of its divisors is an integer number (1281363534).

Almost surely, 2^20428506066 is an apocalyptic number.

20428506066 is an abundant number, since it is smaller than the sum of its proper divisors (20575127022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20428506066 is a wasteful number, since it uses less digits than its factorization.

20428506066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7626.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 20428506066 in words is "twenty billion, four hundred twenty-eight million, five hundred six thousand, sixty-six".