20518033 has 2 divisors, whose sum is σ = 20518034. Its totient is φ = 20518032.

The previous prime is 20518027. The next prime is 20518061. The reversal of 20518033 is 33081502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16785409 + 3732624 = 4097^2 + 1932^2 .

It is a cyclic number.

It is not a de Polignac number, because 20518033 - 2²¹ = 18420881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20517995 and 20518013.

It is not a weakly prime, because it can be changed into another prime (20518073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10259016 + 10259017.

It is an arithmetic number, because the mean of its divisors is an integer number (10259017).

Almost surely, 2^20518033 is an apocalyptic number.

It is an amenable number.

20518033 is a deficient number, since it is larger than the sum of its proper divisors (1).

20518033 is an equidigital number, since it uses as much as digits as its factorization.

20518033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20518033 is about 4529.6835430304. The cubic root of 20518033 is about 273.7654100567.

Adding to 20518033 its reverse (33081502), we get a palindrome (53599535).

The spelling of 20518033 in words is "twenty million, five hundred eighteen thousand, thirty-three".