20172217202 has 4 divisors (see below), whose sum is σ = 30258325806. Its totient is φ = 10086108600.

The previous prime is 20172217189. The next prime is 20172217243. The reversal of 20172217202 is 20271227102.

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., 19911749881 + 260467321 = 141109^2 + 16139^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5043054299 + ... + 5043054302.

Almost surely, 2^20172217202 is an apocalyptic number.

20172217202 is a deficient number, since it is larger than the sum of its proper divisors (10086108604).

20172217202 is a wasteful number, since it uses less digits than its factorization.

20172217202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10086108603.

The product of its (nonzero) digits is 1568, while the sum is 26.

The spelling of 20172217202 in words is "twenty billion, one hundred seventy-two million, two hundred seventeen thousand, two hundred two".