20988849 has 16 divisors (see below), whose sum is σ = 32199680. Its totient is φ = 11912400.

The previous prime is 20988833. The next prime is 20988853. The reversal of 20988849 is 94888902.

It is not a de Polignac number, because 20988849 - 2⁴ = 20988833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20988798 and 20988807.

It is not an unprimeable number, because it can be changed into a prime (20988349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (2012480).

Almost surely, 2^20988849 is an apocalyptic number.

It is an amenable number.

20988849 is a deficient number, since it is larger than the sum of its proper divisors (11210831).

20988849 is a wasteful number, since it uses less digits than its factorization.

20988849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780.

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 20988849 is about 4581.3588595525. The cubic root of 20988849 is about 275.8435760342.

The spelling of 20988849 in words is "twenty million, nine hundred eighty-eight thousand, eight hundred forty-nine".