20025309 has 4 divisors (see below), whose sum is σ = 26700416. Its totient is φ = 13350204.

The previous prime is 20025307. The next prime is 20025311. The reversal of 20025309 is 90352002.

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 an interprime number because it is at equal distance from previous prime (20025307) and next prime (20025311).

It is not a de Polignac number, because 20025309 - 2¹ = 20025307 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 (20025307) 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, 3337549 + ... + 3337554.

It is an arithmetic number, because the mean of its divisors is an integer number (6675104).

Almost surely, 2^20025309 is an apocalyptic number.

It is an amenable number.

20025309 is a deficient number, since it is larger than the sum of its proper divisors (6675107).

20025309 is an equidigital number, since it uses as much as digits as its factorization.

20025309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675106.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 20025309 is about 4474.9646925981. The cubic root of 20025309 is about 271.5562120551.

The spelling of 20025309 in words is "twenty million, twenty-five thousand, three hundred nine".