20533840144 has 10 divisors (see below), whose sum is σ = 39784315310. Its totient is φ = 10266920064.

The previous prime is 20533840097. The next prime is 20533840153. The reversal of 20533840144 is 44104833502.

It can be written as a sum of positive squares in only one way, i.e., 15480336400 + 5053503744 = 124420^2 + 71088^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641682489 + ... + 641682520.

It is an arithmetic number, because the mean of its divisors is an integer number (3978431531).

Almost surely, 2^20533840144 is an apocalyptic number.

It is an amenable number.

20533840144 is a deficient number, since it is larger than the sum of its proper divisors (19250475166).

20533840144 is a wasteful number, since it uses less digits than its factorization.

20533840144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283365017 (or 1283365011 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 20533840144 in words is "twenty billion, five hundred thirty-three million, eight hundred forty thousand, one hundred forty-four".