20741986 has 4 divisors (see below), whose sum is σ = 31112982. Its totient is φ = 10370992.

The previous prime is 20741947. The next prime is 20742017. The reversal of 20741986 is 68914702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 9418761 = 3365^2 + 3069^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5185495 + ... + 5185498.

Almost surely, 2^20741986 is an apocalyptic number.

20741986 is a deficient number, since it is larger than the sum of its proper divisors (10370996).

20741986 is a wasteful number, since it uses less digits than its factorization.

20741986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370995.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20741986 is about 4554.3370538422. The cubic root of 20741986 is about 274.7578518555.

The spelling of 20741986 in words is "twenty million, seven hundred forty-one thousand, nine hundred eighty-six".