20343986 has 8 divisors (see below), whose sum is σ = 32863404. Its totient is φ = 9389520.

The previous prime is 20343979. The next prime is 20343991. The reversal of 20343986 is 68934302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17799961 + 2544025 = 4219^2 + 1595^2 .

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

It is a Curzon number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 391205 + ... + 391256.

Almost surely, 2^20343986 is an apocalyptic number.

20343986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20343986 is a deficient number, since it is larger than the sum of its proper divisors (12519418).

20343986 is a wasteful number, since it uses less digits than its factorization.

20343986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782476.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 20343986 is about 4510.4307998239. The cubic root of 20343986 is about 272.9891268418.

The spelling of 20343986 in words is "twenty million, three hundred forty-three thousand, nine hundred eighty-six".