20784125 has 8 divisors (see below), whose sum is σ = 25938744. Its totient is φ = 16627200.

The previous prime is 20784077. The next prime is 20784143. The reversal of 20784125 is 52148702.

It can be written as a sum of positive squares in 4 ways, for example, as 1194649 + 19589476 = 1093^2 + 4426^2 .

It is not a de Polignac number, because 20784125 - 2¹⁸ = 20521981 is a prime.

It is a Duffinian number.

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, 83012 + ... + 83261.

It is an arithmetic number, because the mean of its divisors is an integer number (3242343).

Almost surely, 2^20784125 is an apocalyptic number.

20784125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20784125 is a deficient number, since it is larger than the sum of its proper divisors (5154619).

20784125 is an equidigital number, since it uses as much as digits as its factorization.

20784125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166288 (or 166278 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20784125 is about 4558.9609561829. The cubic root of 20784125 is about 274.9437901644.

The spelling of 20784125 in words is "twenty million, seven hundred eighty-four thousand, one hundred twenty-five".