20889009 has 48 divisors (see below), whose sum is σ = 33546240. Its totient is φ = 12966480.

The previous prime is 20888983. The next prime is 20889031. The reversal of 20889009 is 90098802.

It is not a de Polignac number, because 20889009 - 2⁵ = 20888977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20889109) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 354022 + ... + 354080.

It is an arithmetic number, because the mean of its divisors is an integer number (698880).

Almost surely, 2^20889009 is an apocalyptic number.

It is an amenable number.

20889009 is a deficient number, since it is larger than the sum of its proper divisors (12657231).

20889009 is an equidigital number, since it uses as much as digits as its factorization.

20889009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 20889009 is about 4570.4495402531. The cubic root of 20889009 is about 275.4055020474.

The spelling of 20889009 in words is "twenty million, eight hundred eighty-nine thousand, nine".