20677143 has 4 divisors (see below), whose sum is σ = 27569528. Its totient is φ = 13784760.

The previous prime is 20677141. The next prime is 20677157. The reversal of 20677143 is 34177602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20677143 - 2¹ = 20677141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20677143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20677141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3446188 + ... + 3446193.

It is an arithmetic number, because the mean of its divisors is an integer number (6892382).

Almost surely, 2^20677143 is an apocalyptic number.

20677143 is a deficient number, since it is larger than the sum of its proper divisors (6892385).

20677143 is an equidigital number, since it uses as much as digits as its factorization.

20677143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892384.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 20677143 is about 4547.2126627199. The cubic root of 20677143 is about 274.4712396170.

The spelling of 20677143 in words is "twenty million, six hundred seventy-seven thousand, one hundred forty-three".