20022009 has 16 divisors (see below), whose sum is σ = 30584832. Its totient is φ = 11413008.

The previous prime is 20021999. The next prime is 20022011. The reversal of 20022009 is 90022002.

It is not a de Polignac number, because 20022009 - 2²⁰ = 18973433 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20022059) 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, 10072 + ... + 11894.

It is an arithmetic number, because the mean of its divisors is an integer number (1911552).

Almost surely, 2^20022009 is an apocalyptic number.

It is an amenable number.

20022009 is a deficient number, since it is larger than the sum of its proper divisors (10562823).

20022009 is a wasteful number, since it uses less digits than its factorization.

20022009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 20022009 is about 4474.5959594135. The cubic root of 20022009 is about 271.5412945203.

The spelling of 20022009 in words is "twenty million, twenty-two thousand, nine".