20212393 has 2 divisors, whose sum is σ = 20212394. Its totient is φ = 20212392.

The previous prime is 20212373. The next prime is 20212399. The reversal of 20212393 is 39321202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 1996569 = 4268^2 + 1413^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106196 + 10106197.

It is an arithmetic number, because the mean of its divisors is an integer number (10106197).

Almost surely, 2^20212393 is an apocalyptic number.

It is an amenable number.

20212393 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212393 is an equidigital number, since it uses as much as digits as its factorization.

20212393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 20212393 is about 4495.8195026046. The cubic root of 20212393 is about 272.3992523787.

Adding to 20212393 its reverse (39321202), we get a palindrome (59533595).

The spelling of 20212393 in words is "twenty million, two hundred twelve thousand, three hundred ninety-three".