19952813 has 2 divisors, whose sum is σ = 19952814. Its totient is φ = 19952812.

The previous prime is 19952791. The next prime is 19952873. The reversal of 19952813 is 31825991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12866569 + 7086244 = 3587^2 + 2662^2 .

It is a cyclic number.

It is not a de Polignac number, because 19952813 - 2¹⁴ = 19936429 is a prime.

It is a super-2 number, since 2×19952813² = 796229493225938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19952873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9976406 + 9976407.

It is an arithmetic number, because the mean of its divisors is an integer number (9976407).

Almost surely, 2^19952813 is an apocalyptic number.

It is an amenable number.

19952813 is a deficient number, since it is larger than the sum of its proper divisors (1).

19952813 is an equidigital number, since it uses as much as digits as its factorization.

19952813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 38.

The square root of 19952813 is about 4466.8571725543. The cubic root of 19952813 is about 271.2281181779.

The spelling of 19952813 in words is "nineteen million, nine hundred fifty-two thousand, eight hundred thirteen".