20253553 has 2 divisors, whose sum is σ = 20253554. Its totient is φ = 20253552.

The previous prime is 20253539. The next prime is 20253581. The reversal of 20253553 is 35535202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 9284209 = 3312^2 + 3047^2 .

It is a cyclic number.

It is not a de Polignac number, because 20253553 - 2⁵ = 20253521 is a prime.

It is not a weakly prime, because it can be changed into another prime (20253353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126776 + 10126777.

It is an arithmetic number, because the mean of its divisors is an integer number (10126777).

Almost surely, 2^20253553 is an apocalyptic number.

It is an amenable number.

20253553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20253553 is an equidigital number, since it uses as much as digits as its factorization.

20253553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4500, while the sum is 25.

The square root of 20253553 is about 4500.3947604627. The cubic root of 20253553 is about 272.5840292999.

Adding to 20253553 its reverse (35535202), we get a palindrome (55788755).

The spelling of 20253553 in words is "twenty million, two hundred fifty-three thousand, five hundred fifty-three".