20360861 has 2 divisors, whose sum is σ = 20360862. Its totient is φ = 20360860.

The previous prime is 20360839. The next prime is 20360881. The reversal of 20360861 is 16806302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16080100 + 4280761 = 4010^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20360861 - 2¹⁸ = 20098717 is a prime.

It is a super-2 number, since 2×20360861² = 829129321322642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20360861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20360881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180430 + 10180431.

It is an arithmetic number, because the mean of its divisors is an integer number (10180431).

Almost surely, 2^20360861 is an apocalyptic number.

It is an amenable number.

20360861 is a deficient number, since it is larger than the sum of its proper divisors (1).

20360861 is an equidigital number, since it uses as much as digits as its factorization.

20360861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20360861 is about 4512.3010759478. The cubic root of 20360861 is about 273.0645859705.

The spelling of 20360861 in words is "twenty million, three hundred sixty thousand, eight hundred sixty-one".