16220805 has 16 divisors (see below), whose sum is σ = 27480384. Its totient is φ = 8142080.

The previous prime is 16220791. The next prime is 16220807. The reversal of 16220805 is 50802261.

16220805 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16220805 - 2⁸ = 16220549 is a prime.

It is a super-2 number, since 2×16220805² = 526229029696050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16220807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31551 + ... + 32060.

It is an arithmetic number, because the mean of its divisors is an integer number (1717524).

Almost surely, 2^16220805 is an apocalyptic number.

16220805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16220805 is a deficient number, since it is larger than the sum of its proper divisors (11259579).

16220805 is a wasteful number, since it uses less digits than its factorization.

16220805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63636.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 16220805 is about 4027.5060521370. The cubic root of 16220805 is about 253.1380718748.

The spelling of 16220805 in words is "sixteen million, two hundred twenty thousand, eight hundred five".