20247725 has 6 divisors (see below), whose sum is σ = 25107210. Its totient is φ = 16198160.

The previous prime is 20247707. The next prime is 20247739. The reversal of 20247725 is 52774202.

It can be written as a sum of positive squares in 3 ways, for example, as 6724 + 20241001 = 82^2 + 4499^2 .

It is not a de Polignac number, because 20247725 - 2¹⁰ = 20246701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404930 + ... + 404979.

It is an arithmetic number, because the mean of its divisors is an integer number (4184535).

Almost surely, 2^20247725 is an apocalyptic number.

20247725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20247725 is a deficient number, since it is larger than the sum of its proper divisors (4859485).

20247725 is an equidigital number, since it uses as much as digits as its factorization.

20247725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809919 (or 809914 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 20247725 is about 4499.7472151222. The cubic root of 20247725 is about 272.5578812602.

The spelling of 20247725 in words is "twenty million, two hundred forty-seven thousand, seven hundred twenty-five".