20525825643 has 32 divisors (see below), whose sum is σ = 27947462400. Its totient is φ = 13398051456.

The previous prime is 20525825633. The next prime is 20525825657. The reversal of 20525825643 is 34652852502.

It is not a de Polignac number, because 20525825643 - 2¹⁶ = 20525760107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20525825595 and 20525825604.

It is not an unprimeable number, because it can be changed into a prime (20525825633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10125196 + ... + 10127222.

It is an arithmetic number, because the mean of its divisors is an integer number (873358200).

Almost surely, 2^20525825643 is an apocalyptic number.

20525825643 is a deficient number, since it is larger than the sum of its proper divisors (7421636757).

20525825643 is a wasteful number, since it uses less digits than its factorization.

20525825643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491.

The product of its (nonzero) digits is 576000, while the sum is 42.

The spelling of 20525825643 in words is "twenty billion, five hundred twenty-five million, eight hundred twenty-five thousand, six hundred forty-three".