20212689 has 8 divisors (see below), whose sum is σ = 30800320. Its totient is φ = 11550096.

The previous prime is 20212667. The next prime is 20212691. The reversal of 20212689 is 98621202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20212689 - 2¹⁵ = 20179921 is a prime.

It is a super-2 number, since 2×20212689² = 817105593221442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481234 + ... + 481275.

It is an arithmetic number, because the mean of its divisors is an integer number (3850040).

Almost surely, 2^20212689 is an apocalyptic number.

It is an amenable number.

20212689 is a deficient number, since it is larger than the sum of its proper divisors (10587631).

20212689 is an equidigital number, since it uses as much as digits as its factorization.

20212689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962519.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20212689 is about 4495.8524219552. The cubic root of 20212689 is about 272.4005820874.

The spelling of 20212689 in words is "twenty million, two hundred twelve thousand, six hundred eighty-nine".