20553739 has 2 divisors, whose sum is σ = 20553740. Its totient is φ = 20553738.

The previous prime is 20553733. The next prime is 20553773. The reversal of 20553739 is 93735502.

It is an a-pointer prime, because the next prime (20553773) can be obtained adding 20553739 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20553739 - 2⁵ = 20553707 is a prime.

It is not a weakly prime, because it can be changed into another prime (20553733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276869 + 10276870.

It is an arithmetic number, because the mean of its divisors is an integer number (10276870).

Almost surely, 2^20553739 is an apocalyptic number.

20553739 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553739 is an equidigital number, since it uses as much as digits as its factorization.

20553739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 20553739 is about 4533.6231647547. The cubic root of 20553739 is about 273.9241225241.

The spelling of 20553739 in words is "twenty million, five hundred fifty-three thousand, seven hundred thirty-nine".