20999088 has 120 divisors (see below), whose sum is σ = 66620736. Its totient is φ = 6350400.

The previous prime is 20999087. The next prime is 20999101. The reversal of 20999088 is 88099902.

It is not an unprimeable number, because it can be changed into a prime (20999087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42523 + ... + 43013.

Almost surely, 2^20999088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20999088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33310368).

20999088 is an abundant number, since it is smaller than the sum of its proper divisors (45621648).

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

20999088 is a wasteful number, since it uses less digits than its factorization.

20999088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 507 counting only the distinct ones).

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

The square root of 20999088 is about 4582.4761865175. The cubic root of 20999088 is about 275.8884237091. Note that the first 3 decimals are identical.

The spelling of 20999088 in words is "twenty million, nine hundred ninety-nine thousand, eighty-eight".