20553139 has 2 divisors, whose sum is σ = 20553140. Its totient is φ = 20553138.

The previous prime is 20553133. The next prime is 20553179. The reversal of 20553139 is 93135502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20553139 - 2⁵ = 20553107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20553133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276569 + 10276570.

It is an arithmetic number, because the mean of its divisors is an integer number (10276570).

Almost surely, 2^20553139 is an apocalyptic number.

20553139 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553139 is an equidigital number, since it uses as much as digits as its factorization.

20553139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 28.

The square root of 20553139 is about 4533.5569920318. The cubic root of 20553139 is about 273.9214570549.

The spelling of 20553139 in words is "twenty million, five hundred fifty-three thousand, one hundred thirty-nine".