20359961 has 2 divisors, whose sum is σ = 20359962.
Its totient is φ = 20359960.
The previous prime is 20359957. The next prime is 20359987. The reversal of 20359961 is 16995302.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 17799961 + 2560000 = 4219^2 + 1600^2
It is a cyclic number.
It is not a de Polignac number, because 20359961 - 22 = 20359957 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (20359951) 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, 10179980 + 10179981.
It is an arithmetic number, because the mean of its divisors is an integer number (10179981).
Almost surely, 220359961 is an apocalyptic number.
It is an amenable number.
20359961 is a deficient number, since it is larger than the sum of its proper divisors (1).
20359961 is an equidigital number, since it uses as much as digits as its factorization.
20359961 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 14580, while the sum is 35.
The square root of 20359961 is about 4512.2013474578.
The cubic root of 20359961 is about 273.0605625364.
The spelling of 20359961 in words is "twenty million, three hundred fifty-nine thousand, nine hundred sixty-one".