20967489 has 24 divisors (see below), whose sum is σ = 31210920. Its totient is φ = 13558272.

The previous prime is 20967487. The next prime is 20967497. The reversal of 20967489 is 98476902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36864 + 20930625 = 192^2 + 4575^2 .

It is not a de Polignac number, because 20967489 - 2¹ = 20967487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53707 + ... + 54095.

It is an arithmetic number, because the mean of its divisors is an integer number (1300455).

Almost surely, 2^20967489 is an apocalyptic number.

It is an amenable number.

20967489 is a deficient number, since it is larger than the sum of its proper divisors (10243431).

20967489 is a wasteful number, since it uses less digits than its factorization.

20967489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 20967489 is about 4579.0270800684. The cubic root of 20967489 is about 275.7499704780.

The spelling of 20967489 in words is "twenty million, nine hundred sixty-seven thousand, four hundred eighty-nine".