20887693 has 8 divisors (see below), whose sum is σ = 21415680. Its totient is φ = 20363280.

The previous prime is 20887687. The next prime is 20887733. The reversal of 20887693 is 39678802.

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 20887693 - 2¹³ = 20879501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887613) 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, 13903 + ... + 15331.

It is an arithmetic number, because the mean of its divisors is an integer number (2676960).

Almost surely, 2^20887693 is an apocalyptic number.

It is an amenable number.

20887693 is a deficient number, since it is larger than the sum of its proper divisors (527987).

20887693 is a wasteful number, since it uses less digits than its factorization.

20887693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 20887693 is about 4570.3055696529. The cubic root of 20887693 is about 275.3997184436.

The spelling of 20887693 in words is "twenty million, eight hundred eighty-seven thousand, six hundred ninety-three".