20212993 has 4 divisors (see below), whose sum is σ = 20254000. Its totient is φ = 20171988.

The previous prime is 20212991. The next prime is 20213047. The reversal of 20212993 is 39921202.

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 20212993 - 2¹ = 20212991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212991) 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, 19755 + ... + 20752.

It is an arithmetic number, because the mean of its divisors is an integer number (5063500).

Almost surely, 2^20212993 is an apocalyptic number.

It is an amenable number.

20212993 is a deficient number, since it is larger than the sum of its proper divisors (41007).

20212993 is an equidigital number, since it uses as much as digits as its factorization.

20212993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41006.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 20212993 is about 4495.8862307670. The cubic root of 20212993 is about 272.4019477206.

The spelling of 20212993 in words is "twenty million, two hundred twelve thousand, nine hundred ninety-three".