20760391 has 4 divisors (see below), whose sum is σ = 21266784. Its totient is φ = 20254000.

The previous prime is 20760379. The next prime is 20760401. The reversal of 20760391 is 19306702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19306702 = 2 ⋅9653351.

It is not a de Polignac number, because 20760391 - 2⁷ = 20760263 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 (20760301) 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, 253135 + ... + 253216.

It is an arithmetic number, because the mean of its divisors is an integer number (5316696).

Almost surely, 2^20760391 is an apocalyptic number.

20760391 is a deficient number, since it is larger than the sum of its proper divisors (506393).

20760391 is an equidigital number, since it uses as much as digits as its factorization.

20760391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506392.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20760391 is about 4556.3572072435. The cubic root of 20760391 is about 274.8390948519.

The spelling of 20760391 in words is "twenty million, seven hundred sixty thousand, three hundred ninety-one".