20090923 has 8 divisors (see below), whose sum is σ = 22392720. Its totient is φ = 17913600.

The previous prime is 20090909. The next prime is 20090927. The reversal of 20090923 is 32909002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20090923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20090927) 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, 30778 + ... + 31423.

It is an arithmetic number, because the mean of its divisors is an integer number (2799090).

Almost surely, 2^20090923 is an apocalyptic number.

20090923 is a deficient number, since it is larger than the sum of its proper divisors (2301797).

20090923 is a wasteful number, since it uses less digits than its factorization.

20090923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62237.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20090923 is about 4482.2899281506. The cubic root of 20090923 is about 271.8524782154.

Adding to 20090923 its reverse (32909002), we get a palindrome (52999925).

The spelling of 20090923 in words is "twenty million, ninety thousand, nine hundred twenty-three".