20340511 has 4 divisors (see below), whose sum is σ = 20674024. Its totient is φ = 20007000.

The previous prime is 20340497. The next prime is 20340521. The reversal of 20340511 is 11504302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20340511 is a prime.

It is a super-2 number, since 2×20340511² = 827472775482242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340521) 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, 166665 + ... + 166786.

It is an arithmetic number, because the mean of its divisors is an integer number (5168506).

Almost surely, 2^20340511 is an apocalyptic number.

20340511 is a deficient number, since it is larger than the sum of its proper divisors (333513).

20340511 is an equidigital number, since it uses as much as digits as its factorization.

20340511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333512.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20340511 is about 4510.0455651800. The cubic root of 20340511 is about 272.9735826701.

Adding to 20340511 its reverse (11504302), we get a palindrome (31844813).

The spelling of 20340511 in words is "twenty million, three hundred forty thousand, five hundred eleven".