20787143 has 8 divisors (see below), whose sum is σ = 23108736. Its totient is φ = 18568800.

The previous prime is 20787133. The next prime is 20787149. The reversal of 20787143 is 34178702.

It is a happy number.

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 20787143 - 2⁴ = 20787127 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 (20787149) 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, 25388 + ... + 26193.

It is an arithmetic number, because the mean of its divisors is an integer number (2888592).

Almost surely, 2^20787143 is an apocalyptic number.

20787143 is a deficient number, since it is larger than the sum of its proper divisors (2321593).

20787143 is a wasteful number, since it uses less digits than its factorization.

20787143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51625.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 20787143 is about 4559.2919406417. The cubic root of 20787143 is about 274.9570974394.

The spelling of 20787143 in words is "twenty million, seven hundred eighty-seven thousand, one hundred forty-three".