20785425 has 24 divisors (see below), whose sum is σ = 34503744. Its totient is φ = 11040960.

The previous prime is 20785423. The next prime is 20785439. The reversal of 20785425 is 52458702.

It is not a de Polignac number, because 20785425 - 2¹ = 20785423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20785423) 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 23 ways as a sum of consecutive naturals, for example, 27604 + ... + 28346.

It is an arithmetic number, because the mean of its divisors is an integer number (1437656).

Almost surely, 2^20785425 is an apocalyptic number.

20785425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20785425 is a deficient number, since it is larger than the sum of its proper divisors (13718319).

20785425 is a wasteful number, since it uses less digits than its factorization.

20785425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 20785425 is about 4559.1035303007. The cubic root of 20785425 is about 274.9495224156.

It can be divided in two parts, 2078 and 5425, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 20785425 in words is "twenty million, seven hundred eighty-five thousand, four hundred twenty-five".