20318797 has 2 divisors, whose sum is σ = 20318798. Its totient is φ = 20318796.

The previous prime is 20318761. The next prime is 20318807. The reversal of 20318797 is 79781302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 4206601 = 4014^2 + 2051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20318797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20318737) 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, 10159398 + 10159399.

It is an arithmetic number, because the mean of its divisors is an integer number (10159399).

Almost surely, 2^20318797 is an apocalyptic number.

It is an amenable number.

20318797 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318797 is an equidigital number, since it uses as much as digits as its factorization.

20318797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 20318797 is about 4507.6376296237. The cubic root of 20318797 is about 272.8764127281.

It can be divided in two parts, 20318 and 797, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20318797 in words is "twenty million, three hundred eighteen thousand, seven hundred ninety-seven".