20755613 has 2 divisors, whose sum is σ = 20755614. Its totient is φ = 20755612.

The previous prime is 20755597. The next prime is 20755649. The reversal of 20755613 is 31655702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 7198489 = 3682^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 20755613 - 2⁴ = 20755597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20751613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10377806 + 10377807.

It is an arithmetic number, because the mean of its divisors is an integer number (10377807).

Almost surely, 2^20755613 is an apocalyptic number.

It is an amenable number.

20755613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20755613 is an equidigital number, since it uses as much as digits as its factorization.

20755613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20755613 is about 4555.8328547040. The cubic root of 20755613 is about 274.8180085125.

The spelling of 20755613 in words is "twenty million, seven hundred fifty-five thousand, six hundred thirteen".