20538725 has 12 divisors (see below), whose sum is σ = 25566816. Its totient is φ = 16367280.

The previous prime is 20538691. The next prime is 20538773. The reversal of 20538725 is 52783502.

It is a de Polignac number, because none of the positive numbers 2^k-20538725 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20538691 and 20538700.

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 11 ways as a sum of consecutive naturals, for example, 5624 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (2130568).

Almost surely, 2^20538725 is an apocalyptic number.

20538725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20538725 is a deficient number, since it is larger than the sum of its proper divisors (5028091).

20538725 is a wasteful number, since it uses less digits than its factorization.

20538725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3191 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 20538725 is about 4531.9670122365. The cubic root of 20538725 is about 273.8574080026.

The spelling of 20538725 in words is "twenty million, five hundred thirty-eight thousand, seven hundred twenty-five".