20002553 has 2 divisors, whose sum is σ = 20002554. Its totient is φ = 20002552.

The previous prime is 20002537. The next prime is 20002579. The reversal of 20002553 is 35520002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18774889 + 1227664 = 4333^2 + 1108^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002553 - 2⁴ = 20002537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20002453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001276 + 10001277.

It is an arithmetic number, because the mean of its divisors is an integer number (10001277).

Almost surely, 2^20002553 is an apocalyptic number.

It is an amenable number.

20002553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002553 is an equidigital number, since it uses as much as digits as its factorization.

20002553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 20002553 is about 4472.4213799686. The cubic root of 20002553 is about 271.4533110150.

Adding to 20002553 its reverse (35520002), we get a palindrome (55522555).

The spelling of 20002553 in words is "twenty million, two thousand, five hundred fifty-three".