20535925 has 18 divisors (see below), whose sum is σ = 26329478. Its totient is φ = 15877440.

The previous prime is 20535923. The next prime is 20535929. The reversal of 20535925 is 52953502.

It can be written as a sum of positive squares in 9 ways, for example, as 9400356 + 11135569 = 3066^2 + 3337^2 .

It is not a de Polignac number, because 20535925 - 2¹ = 20535923 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 (20535923) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 137751 + ... + 137899.

Almost surely, 2^20535925 is an apocalyptic number.

20535925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20535925 is a deficient number, since it is larger than the sum of its proper divisors (5793553).

20535925 is an equidigital number, since it uses as much as digits as its factorization.

20535925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 20535925 is about 4531.6580850722. The cubic root of 20535925 is about 273.8449626408.

The spelling of 20535925 in words is "twenty million, five hundred thirty-five thousand, nine hundred twenty-five".