20606986 has 8 divisors (see below), whose sum is σ = 31043844. Its totient is φ = 10259040.

The previous prime is 20606977. The next prime is 20606987. The reversal of 20606986 is 68960602.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 670761 = 4465^2 + 819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20606987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21645 + ... + 22576.

Almost surely, 2^20606986 is an apocalyptic number.

20606986 is a deficient number, since it is larger than the sum of its proper divisors (10436858).

20606986 is a wasteful number, since it uses less digits than its factorization.

20606986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44456.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20606986 is about 4539.4918217792. The cubic root of 20606986 is about 274.1604633111.

The spelling of 20606986 in words is "twenty million, six hundred six thousand, nine hundred eighty-six".