20777725 has 6 divisors (see below), whose sum is σ = 25764410. Its totient is φ = 16622160.

The previous prime is 20777707. The next prime is 20777737. The reversal of 20777725 is 52777702.

It can be written as a sum of positive squares in 3 ways, for example, as 38809 + 20738916 = 197^2 + 4554^2 .

It is not a de Polignac number, because 20777725 - 2⁷ = 20777597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415530 + ... + 415579.

Almost surely, 2^20777725 is an apocalyptic number.

20777725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20777725 is a deficient number, since it is larger than the sum of its proper divisors (4986685).

20777725 is an equidigital number, since it uses as much as digits as its factorization.

20777725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831119 (or 831114 counting only the distinct ones).

The product of its (nonzero) digits is 48020, while the sum is 37.

The square root of 20777725 is about 4558.2589878154. The cubic root of 20777725 is about 274.9155663654.

The spelling of 20777725 in words is "twenty million, seven hundred seventy-seven thousand, seven hundred twenty-five".