20689869 has 8 divisors (see below), whose sum is σ = 27769792. Its totient is φ = 13701600.

The previous prime is 20689849. The next prime is 20689873. The reversal of 20689869 is 96898602.

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

It is a de Polignac number, because none of the positive numbers 2^k-20689869 is a prime.

It is a super-2 number, since 2×20689869² = 856141358474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689819) 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, 22384 + ... + 23289.

It is an arithmetic number, because the mean of its divisors is an integer number (3471224).

Almost surely, 2^20689869 is an apocalyptic number.

It is an amenable number.

20689869 is a deficient number, since it is larger than the sum of its proper divisors (7079923).

20689869 is a wasteful number, since it uses less digits than its factorization.

20689869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45827.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 20689869 is about 4548.6117662425. The cubic root of 20689869 is about 274.5275369603.

The spelling of 20689869 in words is "twenty million, six hundred eighty-nine thousand, eight hundred sixty-nine".