20092391 has 16 divisors (see below), whose sum is σ = 22619520. Its totient is φ = 17692320.

The previous prime is 20092379. The next prime is 20092399. The reversal of 20092391 is 19329002.

It is a cyclic number.

It is not a de Polignac number, because 20092391 - 2¹⁸ = 19830247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20092391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20092399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53681 + ... + 54053.

It is an arithmetic number, because the mean of its divisors is an integer number (1413720).

Almost surely, 2^20092391 is an apocalyptic number.

20092391 is a deficient number, since it is larger than the sum of its proper divisors (2527129).

20092391 is a wasteful number, since it uses less digits than its factorization.

20092391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 20092391 is about 4482.4536807423. The cubic root of 20092391 is about 271.8590992770.

The spelling of 20092391 in words is "twenty million, ninety-two thousand, three hundred ninety-one".