20212493 has 16 divisors (see below), whose sum is σ = 23814144. Its totient is φ = 16798320.

The previous prime is 20212483. The next prime is 20212499. The reversal of 20212493 is 39421202.

It is not a de Polignac number, because 20212493 - 2⁴ = 20212477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212499) 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, 32996 + ... + 33602.

It is an arithmetic number, because the mean of its divisors is an integer number (1488384).

Almost surely, 2^20212493 is an apocalyptic number.

It is an amenable number.

20212493 is a deficient number, since it is larger than the sum of its proper divisors (3601651).

20212493 is an equidigital number, since it uses as much as digits as its factorization.

20212493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20212493 is about 4495.8306240338. The cubic root of 20212493 is about 272.3997016060.

Adding to 20212493 its reverse (39421202), we get a palindrome (59633695).

The spelling of 20212493 in words is "twenty million, two hundred twelve thousand, four hundred ninety-three".