20023693 has 2 divisors, whose sum is σ = 20023694. Its totient is φ = 20023692.

The previous prime is 20023651. The next prime is 20023699. The reversal of 20023693 is 39632002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19245769 + 777924 = 4387^2 + 882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023699) 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, 10011846 + 10011847.

It is an arithmetic number, because the mean of its divisors is an integer number (10011847).

Almost surely, 2^20023693 is an apocalyptic number.

It is an amenable number.

20023693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023693 is an equidigital number, since it uses as much as digits as its factorization.

20023693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 20023693 is about 4474.7841288715. The cubic root of 20023693 is about 271.5489071883.

Adding to 20023693 its reverse (39632002), we get a palindrome (59655695).

The spelling of 20023693 in words is "twenty million, twenty-three thousand, six hundred ninety-three".