20778325 has 12 divisors (see below), whose sum is σ = 26203680. Its totient is φ = 16339760.

The previous prime is 20778323. The next prime is 20778353. The reversal of 20778325 is 52387702.

It is not a de Polignac number, because 20778325 - 2¹ = 20778323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778323) by changing a digit.

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, 5569 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (2183640).

Almost surely, 2^20778325 is an apocalyptic number.

20778325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20778325 is a deficient number, since it is larger than the sum of its proper divisors (5425355).

20778325 is a wasteful number, since it uses less digits than its factorization.

20778325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14156 (or 14151 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20778325 is about 4558.3248019420. The cubic root of 20778325 is about 274.9182125927.

The spelling of 20778325 in words is "twenty million, seven hundred seventy-eight thousand, three hundred twenty-five".