20747925 has 72 divisors (see below), whose sum is σ = 41434848. Its totient is φ = 9840000.

The previous prime is 20747899. The next prime is 20747929. The reversal of 20747925 is 52974702.

It is not a de Polignac number, because 20747925 - 2⁵ = 20747893 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20747925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20747929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 205375 + ... + 205475.

It is an arithmetic number, because the mean of its divisors is an integer number (575484).

Almost surely, 2^20747925 is an apocalyptic number.

20747925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20747925 is a deficient number, since it is larger than the sum of its proper divisors (20686923).

20747925 is a wasteful number, since it uses less digits than its factorization.

20747925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20747925 is about 4554.9890230384. The cubic root of 20747925 is about 274.7840729250.

It can be divided in two parts, 2074 and 7925, that added together give a palindrome (9999).

The spelling of 20747925 in words is "twenty million, seven hundred forty-seven thousand, nine hundred twenty-five".