20018400228 has 72 divisors (see below), whose sum is σ = 54705006720. Its totient is φ = 6150738240.

The previous prime is 20018400151. The next prime is 20018400277. The reversal of 20018400228 is 82200481002.

20018400228 is a `hidden beast` number, since 20 + 0 + 18 + 400 + 228 = 666.

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, 370188 + ... + 420803.

It is an arithmetic number, because the mean of its divisors is an integer number (759791760).

Almost surely, 2^20018400228 is an apocalyptic number.

It is an amenable number.

20018400228 is an abundant number, since it is smaller than the sum of its proper divisors (34686606492).

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

20018400228 is a wasteful number, since it uses less digits than its factorization.

20018400228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791057 (or 791052 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

It can be divided in two parts, 20018400 and 228, that added together give a triangular number (20018628 = T₆₃₂₇).

The spelling of 20018400228 in words is "twenty billion, eighteen million, four hundred thousand, two hundred twenty-eight".