20770143 has 4 divisors (see below), whose sum is σ = 27693528. Its totient is φ = 13846760.

The previous prime is 20770133. The next prime is 20770147. The reversal of 20770143 is 34107702.

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

It is a cyclic number.

It is not a de Polignac number, because 20770143 - 2¹⁸ = 20507999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20770147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3461688 + ... + 3461693.

It is an arithmetic number, because the mean of its divisors is an integer number (6923382).

Almost surely, 2^20770143 is an apocalyptic number.

20770143 is a deficient number, since it is larger than the sum of its proper divisors (6923385).

20770143 is an equidigital number, since it uses as much as digits as its factorization.

20770143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923384.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 20770143 is about 4557.4272347455. The cubic root of 20770143 is about 274.8821224823.

Adding to 20770143 its reverse (34107702), we get a palindrome (54877845).

The spelling of 20770143 in words is "twenty million, seven hundred seventy thousand, one hundred forty-three".