20625509 has 8 divisors (see below), whose sum is σ = 21787392. Its totient is φ = 19494720.

The previous prime is 20625499. The next prime is 20625529. The reversal of 20625509 is 90552602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20625509 - 2¹² = 20621413 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 (20625529) 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 7 ways as a sum of consecutive naturals, for example, 6404 + ... + 9069.

It is an arithmetic number, because the mean of its divisors is an integer number (2723424).

Almost surely, 2^20625509 is an apocalyptic number.

It is an amenable number.

20625509 is a deficient number, since it is larger than the sum of its proper divisors (1161883).

20625509 is a wasteful number, since it uses less digits than its factorization.

20625509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15547.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 20625509 is about 4541.5315698561. The cubic root of 20625509 is about 274.2425835760.

The spelling of 20625509 in words is "twenty million, six hundred twenty-five thousand, five hundred nine".