20776143 has 8 divisors (see below), whose sum is σ = 27872128. Its totient is φ = 13765464.

The previous prime is 20776141. The next prime is 20776213. The reversal of 20776143 is 34167702.

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

It is not a de Polignac number, because 20776143 - 2¹ = 20776141 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 20776143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20776141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20755 + ... + 21732.

It is an arithmetic number, because the mean of its divisors is an integer number (3484016).

Almost surely, 2^20776143 is an apocalyptic number.

20776143 is a deficient number, since it is larger than the sum of its proper divisors (7095985).

20776143 is a wasteful number, since it uses less digits than its factorization.

20776143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42653.

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

The square root of 20776143 is about 4558.0854533455. The cubic root of 20776143 is about 274.9085889017.

The spelling of 20776143 in words is "twenty million, seven hundred seventy-six thousand, one hundred forty-three".