16420511 has 4 divisors (see below), whose sum is σ = 16428624. Its totient is φ = 16412400.

The previous prime is 16420507. The next prime is 16420517. The reversal of 16420511 is 11502461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 11502461 = 23 ⋅500107.

It is a cyclic number.

It is not a de Polignac number, because 16420511 - 2² = 16420507 is a prime.

It is a super-2 number, since 2×16420511² = 539266363002242, 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 (16420517) 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, 1766 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (4107156).

Almost surely, 2^16420511 is an apocalyptic number.

16420511 is a deficient number, since it is larger than the sum of its proper divisors (8113).

16420511 is an equidigital number, since it uses as much as digits as its factorization.

16420511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8112.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 16420511 is about 4052.2229701733. Note that the first 3 decimals coincide. The cubic root of 16420511 is about 254.1726924069.

Adding to 16420511 its reverse (11502461), we get a palindrome (27922972).

The spelling of 16420511 in words is "sixteen million, four hundred twenty thousand, five hundred eleven".