20945725 has 12 divisors (see below), whose sum is σ = 26033056. Its totient is φ = 16717680.

The previous prime is 20945723. The next prime is 20945731. The reversal of 20945725 is 52754902.

It is not a de Polignac number, because 20945725 - 2¹ = 20945723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20945723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15424 + ... + 16726.

Almost surely, 2^20945725 is an apocalyptic number.

20945725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20945725 is a deficient number, since it is larger than the sum of its proper divisors (5087331).

20945725 is a wasteful number, since it uses less digits than its factorization.

20945725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956 (or 1951 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 20945725 is about 4576.6499756918. The cubic root of 20945725 is about 275.6545290699.

The spelling of 20945725 in words is "twenty million, nine hundred forty-five thousand, seven hundred twenty-five".