20209963 has 2 divisors, whose sum is σ = 20209964. Its totient is φ = 20209962.

The previous prime is 20209961. The next prime is 20209967. The reversal of 20209963 is 36990202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20209963 - 2¹ = 20209961 is a prime.

It is a super-2 number, since 2×20209963² = 816885208922738, which contains 22 as substring.

Together with 20209961, it forms a pair of twin primes.

It is equal to p_1283098 and since 20209963 and 1283098 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20209961) 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, 10104981 + 10104982.

It is an arithmetic number, because the mean of its divisors is an integer number (10104982).

Almost surely, 2^20209963 is an apocalyptic number.

20209963 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209963 is an equidigital number, since it uses as much as digits as its factorization.

20209963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20209963 is about 4495.5492434184. The cubic root of 20209963 is about 272.3883356981.

The spelling of 20209963 in words is "twenty million, two hundred nine thousand, nine hundred sixty-three".