20553555140 has 24 divisors (see below), whose sum is σ = 45434175360. Its totient is φ = 7788715488.

The previous prime is 20553555133. The next prime is 20553555157. The reversal of 20553555140 is 4155535502.

It is a self number, because there is not a number n which added to its sum of digits gives 20553555140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27043772 + ... + 27044531.

It is an arithmetic number, because the mean of its divisors is an integer number (1893090640).

Almost surely, 2^20553555140 is an apocalyptic number.

20553555140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553555140 is an abundant number, since it is smaller than the sum of its proper divisors (24880620220).

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

20553555140 is a wasteful number, since it uses less digits than its factorization.

20553555140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54088331 (or 54088329 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 35.

The spelling of 20553555140 in words is "twenty billion, five hundred fifty-three million, five hundred fifty-five thousand, one hundred forty".