20198970 has 80 divisors (see below), whose sum is σ = 59276448. Its totient is φ = 4894560.

The previous prime is 20198953. The next prime is 20198977. The reversal of 20198970 is 7989102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20198977) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7777 + ... + 10043.

Almost surely, 2^20198970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20198970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29638224).

20198970 is an abundant number, since it is smaller than the sum of its proper divisors (39077478).

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

20198970 is a wasteful number, since it uses less digits than its factorization.

20198970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297 (or 2288 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 20198970 is about 4494.3264233921. The cubic root of 20198970 is about 272.3389391364.

The spelling of 20198970 in words is "twenty million, one hundred ninety-eight thousand, nine hundred seventy".