20889507 has 4 divisors (see below), whose sum is σ = 27852680. Its totient is φ = 13926336.

The previous prime is 20889487. The next prime is 20889509. The reversal of 20889507 is 70598802.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20889507 - 2¹² = 20885411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20889509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3481582 + ... + 3481587.

It is an arithmetic number, because the mean of its divisors is an integer number (6963170).

Almost surely, 2^20889507 is an apocalyptic number.

20889507 is a deficient number, since it is larger than the sum of its proper divisors (6963173).

20889507 is an equidigital number, since it uses as much as digits as its factorization.

20889507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963172.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 20889507 is about 4570.5040203461. The cubic root of 20889507 is about 275.4076906122.

The spelling of 20889507 in words is "twenty million, eight hundred eighty-nine thousand, five hundred seven".