20416778 has 16 divisors (see below), whose sum is σ = 32322240. Its totient is φ = 9652896.

The previous prime is 20416771. The next prime is 20416789. The reversal of 20416778 is 87761402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20416771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1601 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (2020140).

Almost surely, 2^20416778 is an apocalyptic number.

20416778 is a deficient number, since it is larger than the sum of its proper divisors (11905462).

20416778 is a wasteful number, since it uses less digits than its factorization.

20416778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20416778 is about 4518.4928903341. The cubic root of 20416778 is about 273.3143297648.

The spelling of 20416778 in words is "twenty million, four hundred sixteen thousand, seven hundred seventy-eight".