20929553 has 2 divisors, whose sum is σ = 20929554. Its totient is φ = 20929552.

The previous prime is 20929547. The next prime is 20929577. The reversal of 20929553 is 35592902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 208849 = 4552^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 20929553 - 2⁴ = 20929537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20929543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10464776 + 10464777.

It is an arithmetic number, because the mean of its divisors is an integer number (10464777).

Almost surely, 2^20929553 is an apocalyptic number.

It is an amenable number.

20929553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20929553 is an equidigital number, since it uses as much as digits as its factorization.

20929553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 20929553 is about 4574.8828400299. The cubic root of 20929553 is about 275.5835673688.

The spelling of 20929553 in words is "twenty million, nine hundred twenty-nine thousand, five hundred fifty-three".