20168488898 has 4 divisors (see below), whose sum is σ = 30252733350. Its totient is φ = 10084244448.

The previous prime is 20168488897. The next prime is 20168488903. The reversal of 20168488898 is 89888486102.

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., 19901591329 + 266897569 = 141073^2 + 16337^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20168488898.

It is not an unprimeable number, because it can be changed into a prime (20168488897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5042122223 + ... + 5042122226.

Almost surely, 2^20168488898 is an apocalyptic number.

20168488898 is a deficient number, since it is larger than the sum of its proper divisors (10084244452).

20168488898 is a wasteful number, since it uses less digits than its factorization.

20168488898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10084244451.

The product of its (nonzero) digits is 14155776, while the sum is 62.

The spelling of 20168488898 in words is "twenty billion, one hundred sixty-eight million, four hundred eighty-eight thousand, eight hundred ninety-eight".