20998008 has 32 divisors (see below), whose sum is σ = 58328400. Its totient is φ = 6999264.

The previous prime is 20998007. The next prime is 20998013. The reversal of 20998008 is 80089902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20998007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48391 + ... + 48822.

Almost surely, 2^20998008 is an apocalyptic number.

It is an amenable number.

20998008 is an abundant number, since it is smaller than the sum of its proper divisors (37330392).

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

20998008 is a wasteful number, since it uses less digits than its factorization.

20998008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97228 (or 97218 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 20998008 is about 4582.3583447827. The cubic root of 20998008 is about 275.8836939068.

The spelling of 20998008 in words is "twenty million, nine hundred ninety-eight thousand, eight".