20245553 has 2 divisors, whose sum is σ = 20245554. Its totient is φ = 20245552.

The previous prime is 20245541. The next prime is 20245559. The reversal of 20245553 is 35554202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 327184 = 4463^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20245553 - 2¹⁸ = 19983409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20245559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122776 + 10122777.

It is an arithmetic number, because the mean of its divisors is an integer number (10122777).

Almost surely, 2^20245553 is an apocalyptic number.

It is an amenable number.

20245553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245553 is an equidigital number, since it uses as much as digits as its factorization.

20245553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 20245553 is about 4499.5058617586. The cubic root of 20245553 is about 272.5481350313.

Adding to 20245553 its reverse (35554202), we get a palindrome (55799755).

The spelling of 20245553 in words is "twenty million, two hundred forty-five thousand, five hundred fifty-three".