20475198 has 72 divisors (see below), whose sum is σ = 49213008. Its totient is φ = 6139584.

The previous prime is 20475197. The next prime is 20475253. The reversal of 20475198 is 89157402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20475197) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 149386 + ... + 149522.

It is an arithmetic number, because the mean of its divisors is an integer number (683514).

Almost surely, 2^20475198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20475198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24606504).

20475198 is an abundant number, since it is smaller than the sum of its proper divisors (28737810).

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

20475198 is a wasteful number, since it uses less digits than its factorization.

20475198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 20475198 is about 4524.9528174336. The cubic root of 20475198 is about 273.5747661913.

The spelling of 20475198 in words is "twenty million, four hundred seventy-five thousand, one hundred ninety-eight".