20988443 has 8 divisors (see below), whose sum is σ = 25029888. Its totient is φ = 17207784.

The previous prime is 20988437. The next prime is 20988467. The reversal of 20988443 is 34488902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20988443 - 2¹² = 20984347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20988397 and 20988406.

It is not an unprimeable number, because it can be changed into a prime (20988403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65021 + ... + 65342.

It is an arithmetic number, because the mean of its divisors is an integer number (3128736).

Almost surely, 2^20988443 is an apocalyptic number.

20988443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20988443 is a deficient number, since it is larger than the sum of its proper divisors (4041445).

20988443 is a wasteful number, since it uses less digits than its factorization.

20988443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130393.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 20988443 is about 4581.3145493406. The cubic root of 20988443 is about 275.8417974197.

The spelling of 20988443 in words is "twenty million, nine hundred eighty-eight thousand, four hundred forty-three".