20023513 has 2 divisors, whose sum is σ = 20023514. Its totient is φ = 20023512.

The previous prime is 20023469. The next prime is 20023519. The reversal of 20023513 is 31532002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 2408704 = 4197^2 + 1552^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023513 - 2⁹ = 20023001 is a prime.

It is a super-2 number, since 2×20023513² = 801882145722338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20023519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011756 + 10011757.

It is an arithmetic number, because the mean of its divisors is an integer number (10011757).

Almost surely, 2^20023513 is an apocalyptic number.

It is an amenable number.

20023513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023513 is an equidigital number, since it uses as much as digits as its factorization.

20023513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20023513 is about 4474.7640161242. The cubic root of 20023513 is about 271.5480935031.

Adding to 20023513 its reverse (31532002), we get a palindrome (51555515).

The spelling of 20023513 in words is "twenty million, twenty-three thousand, five hundred thirteen".