20091423 has 8 divisors (see below), whose sum is σ = 29223936. Its totient is φ = 12176600.

The previous prime is 20091413. The next prime is 20091427. The reversal of 20091423 is 32419002.

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 20091423 - 2⁵ = 20091391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20091423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091427) 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, 304383 + ... + 304448.

It is an arithmetic number, because the mean of its divisors is an integer number (3652992).

Almost surely, 2^20091423 is an apocalyptic number.

20091423 is a deficient number, since it is larger than the sum of its proper divisors (9132513).

20091423 is a wasteful number, since it uses less digits than its factorization.

20091423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608845.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20091423 is about 4482.3457028659. The cubic root of 20091423 is about 271.8547333816.

The spelling of 20091423 in words is "twenty million, ninety-one thousand, four hundred twenty-three".