20345711 has 4 divisors (see below), whose sum is σ = 20355000. Its totient is φ = 20336424.

The previous prime is 20345687. The next prime is 20345723. The reversal of 20345711 is 11754302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345711 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 (20345761) 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, 665 + ... + 6413.

It is an arithmetic number, because the mean of its divisors is an integer number (5088750).

Almost surely, 2^20345711 is an apocalyptic number.

20345711 is a deficient number, since it is larger than the sum of its proper divisors (9289).

20345711 is an equidigital number, since it uses as much as digits as its factorization.

20345711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9288.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20345711 is about 4510.6220191898. The cubic root of 20345711 is about 272.9968423559.

The spelling of 20345711 in words is "twenty million, three hundred forty-five thousand, seven hundred eleven".