20998080 has 168 divisors, whose sum is σ = 75602592. Its totient is φ = 5339136.

The previous prime is 20998069. The next prime is 20998093. The reversal of 20998080 is 8089902.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66082 + ... + 66398.

Almost surely, 2^20998080 is an apocalyptic number.

20998080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20998080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37801296).

20998080 is an abundant number, since it is smaller than the sum of its proper divisors (54604512).

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

20998080 is a wasteful number, since it uses less digits than its factorization.

20998080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363 (or 350 counting only the distinct ones).

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

The square root of 20998080 is about 4582.3662009927. The cubic root of 20998080 is about 275.8840092320.

It can be divided in two parts, 209 and 98080, that added together give a palindrome (98289).

The spelling of 20998080 in words is "twenty million, nine hundred ninety-eight thousand, eighty".