20550658 has 4 divisors (see below), whose sum is σ = 30825990. Its totient is φ = 10275328.

The previous prime is 20550643. The next prime is 20550659. The reversal of 20550658 is 85605502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85605502 = 2 ⋅42802751.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 363609 = 4493^2 + 603^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (20550659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5137663 + ... + 5137666.

Almost surely, 2^20550658 is an apocalyptic number.

20550658 is a deficient number, since it is larger than the sum of its proper divisors (10275332).

20550658 is a wasteful number, since it uses less digits than its factorization.

20550658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10275331.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 20550658 is about 4533.2833575677. The cubic root of 20550658 is about 273.9104347892.

The spelling of 20550658 in words is "twenty million, five hundred fifty thousand, six hundred fifty-eight".