20942725 has 12 divisors (see below), whose sum is σ = 27497124. Its totient is φ = 15768320.

The previous prime is 20942723. The next prime is 20942741. The reversal of 20942725 is 52724902.

It can be written as a sum of positive squares in 6 ways, for example, as 349281 + 20593444 = 591^2 + 4538^2 .

It is not a de Polignac number, because 20942725 - 2¹ = 20942723 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 (20942723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24214 + ... + 25063.

It is an arithmetic number, because the mean of its divisors is an integer number (2291427).

Almost surely, 2^20942725 is an apocalyptic number.

20942725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20942725 is a deficient number, since it is larger than the sum of its proper divisors (6554399).

20942725 is a wasteful number, since it uses less digits than its factorization.

20942725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49304 (or 49299 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20942725 is about 4576.3222133062. The cubic root of 20942725 is about 275.6413680220.

The spelling of 20942725 in words is "twenty million, nine hundred forty-two thousand, seven hundred twenty-five".