20500725 has 48 divisors (see below), whose sum is σ = 41033088. Its totient is φ = 8816640.

The previous prime is 20500717. The next prime is 20500741. The reversal of 20500725 is 52700502.

It is not a de Polignac number, because 20500725 - 2³ = 20500717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7777 + ... + 10073.

It is an arithmetic number, because the mean of its divisors is an integer number (854856).

Almost surely, 2^20500725 is an apocalyptic number.

20500725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20500725 is an abundant number, since it is smaller than the sum of its proper divisors (20532363).

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

20500725 is a wasteful number, since it uses less digits than its factorization.

20500725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20500725 is about 4527.7726312173. The cubic root of 20500725 is about 273.6884100719.

The spelling of 20500725 in words is "twenty million, five hundred thousand, seven hundred twenty-five".