20001289 has 16 divisors (see below), whose sum is σ = 25036416. Its totient is φ = 15523200.

The previous prime is 20001277. The next prime is 20001301. The reversal of 20001289 is 98210002.

It is an interprime number because it is at equal distance from previous prime (20001277) and next prime (20001301).

It is not a de Polignac number, because 20001289 - 2⁷ = 20001161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001239) 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, 32109 + ... + 32725.

It is an arithmetic number, because the mean of its divisors is an integer number (1564776).

Almost surely, 2^20001289 is an apocalyptic number.

It is an amenable number.

20001289 is a deficient number, since it is larger than the sum of its proper divisors (5035127).

20001289 is a wasteful number, since it uses less digits than its factorization.

20001289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 20001289 is about 4472.2800672588. The cubic root of 20001289 is about 271.4475930081.

The spelling of 20001289 in words is "twenty million, one thousand, two hundred eighty-nine".