20645198 has 16 divisors (see below), whose sum is σ = 35549280. Its totient is φ = 8808576.

The previous prime is 20645197. The next prime is 20645201. The reversal of 20645198 is 89154602.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (2221830).

Almost surely, 2^20645198 is an apocalyptic number.

20645198 is a deficient number, since it is larger than the sum of its proper divisors (14904082).

20645198 is a wasteful number, since it uses less digits than its factorization.

20645198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6571.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20645198 is about 4543.6987136033. The cubic root of 20645198 is about 274.3298193223.

The spelling of 20645198 in words is "twenty million, six hundred forty-five thousand, one hundred ninety-eight".