20198770 has 16 divisors (see below), whose sum is σ = 36518040. Its totient is φ = 8043904.

The previous prime is 20198753. The next prime is 20198779. The reversal of 20198770 is 7789102.

It can be written as a sum of positive squares in 4 ways, for example, as 12794929 + 7403841 = 3577^2 + 2721^2 .

It is not an unprimeable number, because it can be changed into a prime (20198779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2005 + ... + 6664.

Almost surely, 2^20198770 is an apocalyptic number.

20198770 is a deficient number, since it is larger than the sum of its proper divisors (16319270).

20198770 is a wasteful number, since it uses less digits than its factorization.

20198770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8909.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 20198770 is about 4494.3041730617. The cubic root of 20198770 is about 272.3380402792.

The spelling of 20198770 in words is "twenty million, one hundred ninety-eight thousand, seven hundred seventy".