20968693 has 2 divisors, whose sum is σ = 20968694. Its totient is φ = 20968692.

The previous prime is 20968613. The next prime is 20968699. The reversal of 20968693 is 39686902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 10609 = 4578^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20968693 - 2¹³ = 20960501 is a prime.

It is a super-2 number, since 2×20968693² = 879372172256498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20968699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10484346 + 10484347.

It is an arithmetic number, because the mean of its divisors is an integer number (10484347).

Almost surely, 2^20968693 is an apocalyptic number.

It is an amenable number.

20968693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20968693 is an equidigital number, since it uses as much as digits as its factorization.

20968693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20968693 is about 4579.1585471569. The cubic root of 20968693 is about 275.7552484365.

The spelling of 20968693 in words is "twenty million, nine hundred sixty-eight thousand, six hundred ninety-three".