20575643144 has 64 divisors (see below), whose sum is σ = 47082470400. Its totient is φ = 8239392000.

The previous prime is 20575643129. The next prime is 20575643149. The reversal of 20575643144 is 44134657502.

It is not an unprimeable number, because it can be changed into a prime (20575643149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154007 + ... + 254694.

It is an arithmetic number, because the mean of its divisors is an integer number (735663600).

Almost surely, 2^20575643144 is an apocalyptic number.

It is an amenable number.

20575643144 is an abundant number, since it is smaller than the sum of its proper divisors (26506827256).

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

20575643144 is a wasteful number, since it uses less digits than its factorization.

20575643144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408774 (or 408770 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 20575643144 in words is "twenty billion, five hundred seventy-five million, six hundred forty-three thousand, one hundred forty-four".