20250709 has 4 divisors (see below), whose sum is σ = 20335680. Its totient is φ = 20165740.

The previous prime is 20250707. The next prime is 20250733. The reversal of 20250709 is 90705202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20250709 - 2¹ = 20250707 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 (20250701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42127 + ... + 42604.

It is an arithmetic number, because the mean of its divisors is an integer number (5083920).

Almost surely, 2^20250709 is an apocalyptic number.

It is an amenable number.

20250709 is a deficient number, since it is larger than the sum of its proper divisors (84971).

20250709 is an equidigital number, since it uses as much as digits as its factorization.

20250709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84970.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20250709 is about 4500.0787770882. The cubic root of 20250709 is about 272.5712699704.

The spelling of 20250709 in words is "twenty million, two hundred fifty thousand, seven hundred nine".