20606987 has 2 divisors, whose sum is σ = 20606988. Its totient is φ = 20606986.

The previous prime is 20606977. The next prime is 20607007. The reversal of 20606987 is 78960602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20606987 - 2⁸ = 20606731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20606987.

It is not a weakly prime, because it can be changed into another prime (20606917) 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, 10303493 + 10303494.

It is an arithmetic number, because the mean of its divisors is an integer number (10303494).

Almost surely, 2^20606987 is an apocalyptic number.

20606987 is a deficient number, since it is larger than the sum of its proper divisors (1).

20606987 is an equidigital number, since it uses as much as digits as its factorization.

20606987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20606987 is about 4539.4919319237. The cubic root of 20606987 is about 274.1604677458.

The spelling of 20606987 in words is "twenty million, six hundred six thousand, nine hundred eighty-seven".