20973489 has 8 divisors (see below), whose sum is σ = 28000512. Its totient is φ = 13964400.

The previous prime is 20973457. The next prime is 20973499. The reversal of 20973489 is 98437902.

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

It is not a de Polignac number, because 20973489 - 2⁵ = 20973457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20973489.

It is not an unprimeable number, because it can be changed into a prime (20973499) 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, 1462 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (3500064).

Almost surely, 2^20973489 is an apocalyptic number.

It is an amenable number.

20973489 is a deficient number, since it is larger than the sum of its proper divisors (7027023).

20973489 is an equidigital number, since it uses as much as digits as its factorization.

20973489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8967.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20973489 is about 4579.6821942139. The cubic root of 20973489 is about 275.7762705917.

The spelling of 20973489 in words is "twenty million, nine hundred seventy-three thousand, four hundred eighty-nine".