20189651 has 2 divisors, whose sum is σ = 20189652. Its totient is φ = 20189650.

The previous prime is 20189641. The next prime is 20189681. The reversal of 20189651 is 15698102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20189651 - 2¹⁸ = 19927507 is a prime.

It is not a weakly prime, because it can be changed into another prime (20189621) 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, 10094825 + 10094826.

It is an arithmetic number, because the mean of its divisors is an integer number (10094826).

Almost surely, 2^20189651 is an apocalyptic number.

20189651 is a deficient number, since it is larger than the sum of its proper divisors (1).

20189651 is an equidigital number, since it uses as much as digits as its factorization.

20189651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20189651 is about 4493.2895522101. The cubic root of 20189651 is about 272.2970505818.

The spelling of 20189651 in words is "twenty million, one hundred eighty-nine thousand, six hundred fifty-one".