20680998 has 16 divisors (see below), whose sum is σ = 44543856. Its totient is φ = 6363360.

The previous prime is 20680997. The next prime is 20681009. The reversal of 20680998 is 89908602.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680997) 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, 132493 + ... + 132648.

It is an arithmetic number, because the mean of its divisors is an integer number (2783991).

Almost surely, 2^20680998 is an apocalyptic number.

20680998 is an abundant number, since it is smaller than the sum of its proper divisors (23862858).

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

20680998 is a wasteful number, since it uses less digits than its factorization.

20680998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265159.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 20680998 is about 4547.6365290115. The cubic root of 20680998 is about 274.4882958238.

The spelling of 20680998 in words is "twenty million, six hundred eighty thousand, nine hundred ninety-eight".