20392397 has 2 divisors, whose sum is σ = 20392398. Its totient is φ = 20392396.

The previous prime is 20392373. The next prime is 20392403. The reversal of 20392397 is 79329302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11930116 + 8462281 = 3454^2 + 2909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20392397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20392357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10196198 + 10196199.

It is an arithmetic number, because the mean of its divisors is an integer number (10196199).

Almost surely, 2^20392397 is an apocalyptic number.

It is an amenable number.

20392397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20392397 is an equidigital number, since it uses as much as digits as its factorization.

20392397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 20392397 is about 4515.7941715716. The cubic root of 20392397 is about 273.2054923021.

The spelling of 20392397 in words is "twenty million, three hundred ninety-two thousand, three hundred ninety-seven".