20535725 has 24 divisors (see below), whose sum is σ = 29789760. Its totient is φ = 13749120.

The previous prime is 20535719. The next prime is 20535731. The reversal of 20535725 is 52753502.

It is an interprime number because it is at equal distance from previous prime (20535719) and next prime (20535731).

It is not a de Polignac number, because 20535725 - 2⁶ = 20535661 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6161 + ... + 8889.

It is an arithmetic number, because the mean of its divisors is an integer number (1241240).

Almost surely, 2^20535725 is an apocalyptic number.

20535725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20535725 is a deficient number, since it is larger than the sum of its proper divisors (9254035).

20535725 is a wasteful number, since it uses less digits than its factorization.

20535725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 20535725 is about 4531.6360180403. The cubic root of 20535725 is about 273.8440736431.

The spelling of 20535725 in words is "twenty million, five hundred thirty-five thousand, seven hundred twenty-five".