20645098 has 4 divisors (see below), whose sum is σ = 30967650. Its totient is φ = 10322548.

The previous prime is 20645083. The next prime is 20645111. The reversal of 20645098 is 89054602.

It is a happy number.

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., 15155449 + 5489649 = 3893^2 + 2343^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5161273 + ... + 5161276.

Almost surely, 2^20645098 is an apocalyptic number.

20645098 is a deficient number, since it is larger than the sum of its proper divisors (10322552).

20645098 is a wasteful number, since it uses less digits than its factorization.

20645098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322551.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 20645098 is about 4543.6877093392. The cubic root of 20645098 is about 274.3293763940.

The spelling of 20645098 in words is "twenty million, six hundred forty-five thousand, ninety-eight".