20393797 has 2 divisors, whose sum is σ = 20393798. Its totient is φ = 20393796.

The previous prime is 20393777. The next prime is 20393839. The reversal of 20393797 is 79739302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14371681 + 6022116 = 3791^2 + 2454^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20393797 is a prime.

It is a Chen prime.

It is equal to p_1293997 and since 20393797 and 1293997 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20393717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10196898 + 10196899.

It is an arithmetic number, because the mean of its divisors is an integer number (10196899).

Almost surely, 2^20393797 is an apocalyptic number.

It is an amenable number.

20393797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20393797 is an equidigital number, since it uses as much as digits as its factorization.

20393797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 20393797 is about 4515.9491804049. The cubic root of 20393797 is about 273.2117442880.

The spelling of 20393797 in words is "twenty million, three hundred ninety-three thousand, seven hundred ninety-seven".