20030551 has 2 divisors, whose sum is σ = 20030552. Its totient is φ = 20030550.

The previous prime is 20030519. The next prime is 20030587. The reversal of 20030551 is 15503002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20030551 - 2⁵ = 20030519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20040551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10015275 + 10015276.

It is an arithmetic number, because the mean of its divisors is an integer number (10015276).

Almost surely, 2^20030551 is an apocalyptic number.

20030551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20030551 is an equidigital number, since it uses as much as digits as its factorization.

20030551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20030551 is about 4475.5503572187. The cubic root of 20030551 is about 271.5799049641.

Adding to 20030551 its reverse (15503002), we get a palindrome (35533553).

The spelling of 20030551 in words is "twenty million, thirty thousand, five hundred fifty-one".