20740658 has 4 divisors (see below), whose sum is σ = 31110990. Its totient is φ = 10370328.

The previous prime is 20740633. The next prime is 20740673. The reversal of 20740658 is 85604702.

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., 16752649 + 3988009 = 4093^2 + 1997^2 .

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 as a sum of consecutive naturals, namely, 5185163 + ... + 5185166.

Almost surely, 2^20740658 is an apocalyptic number.

20740658 is a deficient number, since it is larger than the sum of its proper divisors (10370332).

20740658 is a wasteful number, since it uses less digits than its factorization.

20740658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10370331.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20740658 is about 4554.1912564142. The cubic root of 20740658 is about 274.7519879649.

The spelling of 20740658 in words is "twenty million, seven hundred forty thousand, six hundred fifty-eight".