20489198 has 4 divisors (see below), whose sum is σ = 30733800. Its totient is φ = 10244598.

The previous prime is 20489191. The next prime is 20489221. The reversal of 20489198 is 89198402.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20489191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5122298 + ... + 5122301.

It is an arithmetic number, because the mean of its divisors is an integer number (7683450).

Almost surely, 2^20489198 is an apocalyptic number.

20489198 is a deficient number, since it is larger than the sum of its proper divisors (10244602).

20489198 is a wasteful number, since it uses less digits than its factorization.

20489198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10244601.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 20489198 is about 4526.4995305423. The cubic root of 20489198 is about 273.6371046055.

The spelling of 20489198 in words is "twenty million, four hundred eighty-nine thousand, one hundred ninety-eight".