20930393 has 4 divisors (see below), whose sum is σ = 22833168. Its totient is φ = 19027620.

The previous prime is 20930387. The next prime is 20930401. The reversal of 20930393 is 39303902.

It is a happy number.

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 20930393 - 2²⁰ = 19881817 is a prime.

It is a super-2 number, since 2×20930393² = 876162702268898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20930323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951371 + ... + 951392.

It is an arithmetic number, because the mean of its divisors is an integer number (5708292).

Almost surely, 2^20930393 is an apocalyptic number.

It is an amenable number.

20930393 is a deficient number, since it is larger than the sum of its proper divisors (1902775).

20930393 is a wasteful number, since it uses less digits than its factorization.

20930393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902774.

The product of its (nonzero) digits is 4374, while the sum is 29.

The square root of 20930393 is about 4574.9746447385. The cubic root of 20930393 is about 275.5872541349.

The spelling of 20930393 in words is "twenty million, nine hundred thirty thousand, three hundred ninety-three".