20434553 has 2 divisors, whose sum is σ = 20434554. Its totient is φ = 20434552.

The previous prime is 20434537. The next prime is 20434571. The reversal of 20434553 is 35543402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 3853369 = 4072^2 + 1963^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434553 - 2⁴ = 20434537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20434853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217276 + 10217277.

It is an arithmetic number, because the mean of its divisors is an integer number (10217277).

Almost surely, 2^20434553 is an apocalyptic number.

It is an amenable number.

20434553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434553 is an equidigital number, since it uses as much as digits as its factorization.

20434553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20434553 is about 4520.4593793109. The cubic root of 20434553 is about 273.3936232596.

Adding to 20434553 its reverse (35543402), we get a palindrome (55977955).

The spelling of 20434553 in words is "twenty million, four hundred thirty-four thousand, five hundred fifty-three".