20221689 has 8 divisors (see below), whose sum is σ = 27201312. Its totient is φ = 13361600.

The previous prime is 20221679. The next prime is 20221693. The reversal of 20221689 is 98612202.

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

It is a cyclic number.

It is not a de Polignac number, because 20221689 - 2⁸ = 20221433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20221639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29487 + ... + 30164.

It is an arithmetic number, because the mean of its divisors is an integer number (3400164).

Almost surely, 2^20221689 is an apocalyptic number.

It is an amenable number.

20221689 is a deficient number, since it is larger than the sum of its proper divisors (6979623).

20221689 is a wasteful number, since it uses less digits than its factorization.

20221689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59767.

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

The square root of 20221689 is about 4496.8532330953. The cubic root of 20221689 is about 272.4410062232.

It can be divided in two parts, 20221 and 689, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20221689 in words is "twenty million, two hundred twenty-one thousand, six hundred eighty-nine".