20284354728 has 96 divisors (see below), whose sum is σ = 60653305440. Its totient is φ = 6072696960.

The previous prime is 20284354709. The next prime is 20284354733. The reversal of 20284354728 is 82745348202.

20284354728 is a `hidden beast` number, since 2 + 0 + 2 + 84 + 3 + 547 + 28 = 666.

It is a super-2 number, since 2×20284354728² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88551 + ... + 220022.

It is an arithmetic number, because the mean of its divisors is an integer number (631805265).

Almost surely, 2^20284354728 is an apocalyptic number.

It is an amenable number.

20284354728 is an abundant number, since it is smaller than the sum of its proper divisors (40368950712).

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

20284354728 is a wasteful number, since it uses less digits than its factorization.

20284354728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308679 (or 308672 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 45.

The spelling of 20284354728 in words is "twenty billion, two hundred eighty-four million, three hundred fifty-four thousand, seven hundred twenty-eight".