20361997 has 2 divisors, whose sum is σ = 20361998. Its totient is φ = 20361996.

The previous prime is 20361989. The next prime is 20362003. The reversal of 20361997 is 79916302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 6081156 = 3779^2 + 2466^2 .

It is a cyclic number.

It is not a de Polignac number, because 20361997 - 2³ = 20361989 is a prime.

It is a super-2 number, since 2×20361997² = 829221843656018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20361917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180998 + 10180999.

It is an arithmetic number, because the mean of its divisors is an integer number (10180999).

Almost surely, 2^20361997 is an apocalyptic number.

It is an amenable number.

20361997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20361997 is an equidigital number, since it uses as much as digits as its factorization.

20361997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 20361997 is about 4512.4269523173. The cubic root of 20361997 is about 273.0696642692.

The spelling of 20361997 in words is "twenty million, three hundred sixty-one thousand, nine hundred ninety-seven".