20213293 has 2 divisors, whose sum is σ = 20213294. Its totient is φ = 20213292.

The previous prime is 20213273. The next prime is 20213309. The reversal of 20213293 is 39231202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 26244 = 4493^2 + 162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106646 + 10106647.

It is an arithmetic number, because the mean of its divisors is an integer number (10106647).

Almost surely, 2^20213293 is an apocalyptic number.

It is an amenable number.

20213293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213293 is an equidigital number, since it uses as much as digits as its factorization.

20213293 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20213293 is about 4495.9195944768. The cubic root of 20213293 is about 272.4032953716.

Adding to 20213293 its reverse (39231202), we get a palindrome (59444495).

The spelling of 20213293 in words is "twenty million, two hundred thirteen thousand, two hundred ninety-three".