206626493 has 4 divisors (see below), whose sum is σ = 206932380. Its totient is φ = 206320608.

The previous prime is 206626487. The next prime is 206626499. The reversal of 206626493 is 394626602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (206626487) and next prime (206626499).

It can be written as a sum of positive squares in 2 ways, for example, as 181656484 + 24970009 = 13478^2 + 4997^2 .

It is a cyclic number.

It is not a de Polignac number, because 206626493 - 2⁴ = 206626477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206626499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151928 + ... + 153281.

It is an arithmetic number, because the mean of its divisors is an integer number (51733095).

Almost surely, 2^206626493 is an apocalyptic number.

It is an amenable number.

206626493 is a deficient number, since it is larger than the sum of its proper divisors (305887).

206626493 is an equidigital number, since it uses as much as digits as its factorization.

206626493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305886.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 206626493 is about 14374.5084437695. The cubic root of 206626493 is about 591.1921628737.

The spelling of 206626493 in words is "two hundred six million, six hundred twenty-six thousand, four hundred ninety-three".