20090915 has 8 divisors (see below), whose sum is σ = 25963728. Its totient is φ = 14836320.

The previous prime is 20090909. The next prime is 20090927. The reversal of 20090915 is 51909002.

It is a happy number.

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

It is not a de Polignac number, because 20090915 - 2⁸ = 20090659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154481 + ... + 154610.

It is an arithmetic number, because the mean of its divisors is an integer number (3245466).

Almost surely, 2^20090915 is an apocalyptic number.

20090915 is a deficient number, since it is larger than the sum of its proper divisors (5872813).

20090915 is a wasteful number, since it uses less digits than its factorization.

20090915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309109.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 20090915 is about 4482.2890357495. The cubic root of 20090915 is about 271.8524421324.

Adding to 20090915 its reverse (51909002), we get a palindrome (71999917).

The spelling of 20090915 in words is "twenty million, ninety thousand, nine hundred fifteen".