20988441 has 6 divisors (see below), whose sum is σ = 30316650. Its totient is φ = 13992288.

The previous prime is 20988437. The next prime is 20988467. The reversal of 20988441 is 14488902.

20988441 is a `hidden beast` number, since 209 + 8 + 8 + 441 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 9455625 = 3396^2 + 3075^2 .

It is not a de Polignac number, because 20988441 - 2² = 20988437 is a prime.

It is a super-2 number, since 2×20988441² = 881029311220962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20988396 and 20988405.

It is not an unprimeable number, because it can be changed into a prime (20988481) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1166016 + ... + 1166033.

It is an arithmetic number, because the mean of its divisors is an integer number (5052775).

Almost surely, 2^20988441 is an apocalyptic number.

It is an amenable number.

20988441 is a deficient number, since it is larger than the sum of its proper divisors (9328209).

20988441 is a wasteful number, since it uses less digits than its factorization.

20988441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332055 (or 2332052 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20988441 is about 4581.3143310626. The cubic root of 20988441 is about 275.8417886580.

The spelling of 20988441 in words is "twenty million, nine hundred eighty-eight thousand, four hundred forty-one".