20066393 has 4 divisors (see below), whose sum is σ = 20713728. Its totient is φ = 19419060.

The previous prime is 20066369. The next prime is 20066399. The reversal of 20066393 is 39366002.

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 20066393 - 2²² = 15872089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20066399) 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, 323621 + ... + 323682.

It is an arithmetic number, because the mean of its divisors is an integer number (5178432).

Almost surely, 2^20066393 is an apocalyptic number.

It is an amenable number.

20066393 is a deficient number, since it is larger than the sum of its proper divisors (647335).

20066393 is an equidigital number, since it uses as much as digits as its factorization.

20066393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647334.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 20066393 is about 4479.5527678553. The cubic root of 20066393 is about 271.7417937848.

The spelling of 20066393 in words is "twenty million, sixty-six thousand, three hundred ninety-three".