20851056625 has 64 divisors (see below), whose sum is σ = 30167354880. Its totient is φ = 14093721600.

The previous prime is 20851056623. The next prime is 20851056673. The reversal of 20851056625 is 52665015802.

It is not a de Polignac number, because 20851056625 - 2¹ = 20851056623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20851056623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22444161 + ... + 22445089.

It is an arithmetic number, because the mean of its divisors is an integer number (471364920).

Almost surely, 2^20851056625 is an apocalyptic number.

20851056625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20851056625 is a deficient number, since it is larger than the sum of its proper divisors (9316298255).

20851056625 is a wasteful number, since it uses less digits than its factorization.

20851056625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 20851056625 in words is "twenty billion, eight hundred fifty-one million, fifty-six thousand, six hundred twenty-five".