20500725836440 has 32 divisors (see below), whose sum is σ = 46158248502000. Its totient is φ = 8194669824384.

The previous prime is 20500725836419. The next prime is 20500725836537. The reversal of 20500725836440 is 4463852700502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175581855 + ... + 175698574.

Almost surely, 2^{20500725836440} is an apocalyptic number.

20500725836440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20500725836440 is an abundant number, since it is smaller than the sum of its proper divisors (25657522665560).

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

20500725836440 is a wasteful number, since it uses less digits than its factorization.

20500725836440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351281899 (or 351281895 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 46.

The spelling of 20500725836440 in words is "twenty trillion, five hundred billion, seven hundred twenty-five million, eight hundred thirty-six thousand, four hundred forty".