20117898 has 12 divisors (see below), whose sum is σ = 43588818. Its totient is φ = 6705960.

The previous prime is 20117891. The next prime is 20117917. The reversal of 20117898 is 89871102.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 4173849 = 3993^2 + 2043^2 .

It is not an unprimeable number, because it can be changed into a prime (20117891) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 558813 + ... + 558848.

Almost surely, 2^20117898 is an apocalyptic number.

20117898 is an abundant number, since it is smaller than the sum of its proper divisors (23470920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20117898 is a wasteful number, since it uses less digits than its factorization.

20117898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117669 (or 1117666 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 20117898 is about 4485.2979834120. The cubic root of 20117898 is about 271.9740910298.

The spelling of 20117898 in words is "twenty million, one hundred seventeen thousand, eight hundred ninety-eight".