20980998 has 32 divisors (see below), whose sum is σ = 47889120. Its totient is φ = 6804000.

The previous prime is 20980987. The next prime is 20981027. The reversal of 20980998 is 89908902.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3253 + ... + 7248.

It is an arithmetic number, because the mean of its divisors is an integer number (1496535).

Almost surely, 2^20980998 is an apocalyptic number.

20980998 is an abundant number, since it is smaller than the sum of its proper divisors (26908122).

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

20980998 is a wasteful number, since it uses less digits than its factorization.

20980998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10549 (or 10543 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 20980998 is about 4580.5019375610. The cubic root of 20980998 is about 275.8091781182.

The spelling of 20980998 in words is "twenty million, nine hundred eighty thousand, nine hundred ninety-eight".