20102509 has 8 divisors (see below), whose sum is σ = 23061248. Its totient is φ = 17165520.

The previous prime is 20102503. The next prime is 20102527. The reversal of 20102509 is 90520102.

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 20102509 - 2⁹ = 20101997 is a prime.

It is a super-2 number, since 2×20102509² = 808221736190162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3402 + ... + 7195.

It is an arithmetic number, because the mean of its divisors is an integer number (2882656).

Almost surely, 2^20102509 is an apocalyptic number.

It is an amenable number.

20102509 is a deficient number, since it is larger than the sum of its proper divisors (2958739).

20102509 is a wasteful number, since it uses less digits than its factorization.

20102509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10875.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20102509 is about 4483.5821616203. The cubic root of 20102509 is about 271.9047253182.

The spelling of 20102509 in words is "twenty million, one hundred two thousand, five hundred nine".