20302993 has 2 divisors, whose sum is σ = 20302994. Its totient is φ = 20302992.

The previous prime is 20302969. The next prime is 20303011. The reversal of 20302993 is 39920302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 8661249 = 3412^2 + 2943^2 .

It is a cyclic number.

It is not a de Polignac number, because 20302993 - 2⁹ = 20302481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20302693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10151496 + 10151497.

It is an arithmetic number, because the mean of its divisors is an integer number (10151497).

Almost surely, 2^20302993 is an apocalyptic number.

It is an amenable number.

20302993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20302993 is an equidigital number, since it uses as much as digits as its factorization.

20302993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 20302993 is about 4505.8842639375. The cubic root of 20302993 is about 272.8056464419.

It can be divided in two parts, 2030299 and 3, that added together give a palindrome (2030302).

The spelling of 20302993 in words is "twenty million, three hundred two thousand, nine hundred ninety-three".