20998680 has 32 divisors (see below), whose sum is σ = 62996400. Its totient is φ = 5599616.

The previous prime is 20998673. The next prime is 20998727. The reversal of 20998680 is 8689902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87375 + ... + 87614.

Almost surely, 2^20998680 is an apocalyptic number.

20998680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20998680 is an abundant number, since it is smaller than the sum of its proper divisors (41997720).

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

20998680 is a wasteful number, since it uses less digits than its factorization.

20998680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175003 (or 174999 counting only the distinct ones).

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

The square root of 20998680 is about 4582.4316688850. The cubic root of 20998680 is about 275.8866369140.

It can be divided in two parts, 209 and 98680, that added together give a palindrome (98889).

The spelling of 20998680 in words is "twenty million, nine hundred ninety-eight thousand, six hundred eighty".