20289937 has 16 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 18712512.

The previous prime is 20289911. The next prime is 20289977. The reversal of 20289937 is 73998202.

It is a cyclic number.

It is not a de Polignac number, because 20289937 - 2⁷ = 20289809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20289937.

It is not an unprimeable number, because it can be changed into a prime (20289977) 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, 65938 + ... + 66244.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

It is a vampire number, since it can be written as 2279 ⋅ 8903 (with its own digits).

Almost surely, 2^20289937 is an apocalyptic number.

It is an amenable number.

20289937 is a deficient number, since it is larger than the sum of its proper divisors (1664303).

20289937 is a wasteful number, since it uses less digits than its factorization.

20289937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 20289937 is about 4504.4352587200. The cubic root of 20289937 is about 272.7471572943.

The spelling of 20289937 in words is "twenty million, two hundred eighty-nine thousand, nine hundred thirty-seven".