20930625 has 45 divisors (see below), whose sum is σ = 38408799. Its totient is φ = 10980000.

The previous prime is 20930617. The next prime is 20930627. The reversal of 20930625 is 52603902.

The square root of 20930625 is 4575.

It is a perfect power (a square), and thus also a powerful number.

20930625 is a `hidden beast` number, since 2 + 0 + 9 + 30 + 625 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 20711601 + 219024 = 4551^2 + 468^2 .

It is a tau number, because it is divible by the number of its divisors (45).

It is not a de Polignac number, because 20930625 - 2³ = 20930617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20930627) 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 44 ways as a sum of consecutive naturals, for example, 343095 + ... + 343155.

Almost surely, 2^20930625 is an apocalyptic number.

20930625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20930625 is the 4575-th square number.

20930625 is the 2288-th centered octagonal number.

It is an amenable number.

20930625 is a deficient number, since it is larger than the sum of its proper divisors (17478174).

20930625 is an frugal number, since it uses more digits than its factorization.

20930625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The cubic root of 20930625 is about 275.5882723672.

The spelling of 20930625 in words is "twenty million, nine hundred thirty thousand, six hundred twenty-five".