20025705640 has 32 divisors (see below), whose sum is σ = 45062143560. Its totient is φ = 8009516800.

The previous prime is 20025705599. The next prime is 20025705647. The reversal of 20025705640 is 4650752002.

It can be written as a sum of positive squares in 4 ways, for example, as 14332399524 + 5693306116 = 119718^2 + 75454^2 .

It is not an unprimeable number, because it can be changed into a prime (20025705647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602250 + ... + 634630.

Almost surely, 2^20025705640 is an apocalyptic number.

20025705640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20025705640 is an abundant number, since it is smaller than the sum of its proper divisors (25036437920).

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

20025705640 is a wasteful number, since it uses less digits than its factorization.

20025705640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47853 (or 47849 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 20025705640 in words is "twenty billion, twenty-five million, seven hundred five thousand, six hundred forty".