20525645643 has 8 divisors (see below), whose sum is σ = 27369031056. Its totient is φ = 13683012000.

The previous prime is 20525645627. The next prime is 20525645653. The reversal of 20525645643 is 34654652502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20525645643 - 2⁴ = 20525645627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20525645595 and 20525645604.

It is not an unprimeable number, because it can be changed into a prime (20525645653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120808 + ... + 235893.

It is an arithmetic number, because the mean of its divisors is an integer number (3421128882).

Almost surely, 2^20525645643 is an apocalyptic number.

20525645643 is a deficient number, since it is larger than the sum of its proper divisors (6843385413).

20525645643 is a wasteful number, since it uses less digits than its factorization.

20525645643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375885.

The product of its (nonzero) digits is 864000, while the sum is 42.

The spelling of 20525645643 in words is "twenty billion, five hundred twenty-five million, six hundred forty-five thousand, six hundred forty-three".