20545725 has 12 divisors (see below), whose sum is σ = 33969056. Its totient is φ = 10957680.

The previous prime is 20545711. The next prime is 20545769. The reversal of 20545725 is 52754502.

It is not a de Polignac number, because 20545725 - 2⁴ = 20545709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20545692 and 20545701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136897 + ... + 137046.

Almost surely, 2^20545725 is an apocalyptic number.

20545725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20545725 is a deficient number, since it is larger than the sum of its proper divisors (13423331).

20545725 is a wasteful number, since it uses less digits than its factorization.

20545725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273956 (or 273951 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 30.

The square root of 20545725 is about 4532.7392380326. The cubic root of 20545725 is about 273.8885164593. Note that the first 3 decimals are identical.

The spelling of 20545725 in words is "twenty million, five hundred forty-five thousand, seven hundred twenty-five".