20155393 has 4 divisors (see below), whose sum is σ = 20171200. Its totient is φ = 20139588.

The previous prime is 20155367. The next prime is 20155411. The reversal of 20155393 is 39355102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20155393 - 2⁹ = 20154881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20165393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5805 + ... + 8602.

It is an arithmetic number, because the mean of its divisors is an integer number (5042800).

Almost surely, 2^20155393 is an apocalyptic number.

It is an amenable number.

20155393 is a deficient number, since it is larger than the sum of its proper divisors (15807).

20155393 is a wasteful number, since it uses less digits than its factorization.

20155393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15806.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 20155393 is about 4489.4758045901. The cubic root of 20155393 is about 272.1429512780.

The spelling of 20155393 in words is "twenty million, one hundred fifty-five thousand, three hundred ninety-three".