20016778 has 16 divisors (see below), whose sum is σ = 31217760. Its totient is φ = 9617616.

The previous prime is 20016767. The next prime is 20016781. The reversal of 20016778 is 87761002.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4513 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (1951110).

Almost surely, 2^20016778 is an apocalyptic number.

20016778 is a deficient number, since it is larger than the sum of its proper divisors (11200982).

20016778 is a wasteful number, since it uses less digits than its factorization.

20016778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20016778 is about 4474.0113991808. The cubic root of 20016778 is about 271.5176446087.

The spelling of 20016778 in words is "twenty million, sixteen thousand, seven hundred seventy-eight".