20781167 has 8 divisors (see below), whose sum is σ = 23656320. Its totient is φ = 18070360.

The previous prime is 20781149. The next prime is 20781181. The reversal of 20781167 is 76118702.

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

It is not a de Polignac number, because 20781167 - 2¹⁰ = 20780143 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 (20781367) 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, 40817 + ... + 41322.

It is an arithmetic number, because the mean of its divisors is an integer number (2957040).

Almost surely, 2^20781167 is an apocalyptic number.

20781167 is a deficient number, since it is larger than the sum of its proper divisors (2875153).

20781167 is a wasteful number, since it uses less digits than its factorization.

20781167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82173.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 20781167 is about 4558.6365286125. The cubic root of 20781167 is about 274.9307461975.

Adding to 20781167 its reverse (76118702), we get a palindrome (96899869).

It can be divided in two parts, 20 and 781167, that added together give a palindrome (781187).

The spelling of 20781167 in words is "twenty million, seven hundred eighty-one thousand, one hundred sixty-seven".