20778079 has 16 divisors (see below), whose sum is σ = 24385536. Its totient is φ = 17337600.

The previous prime is 20778071. The next prime is 20778083. The reversal of 20778079 is 97087702.

It is not a de Polignac number, because 20778079 - 2³ = 20778071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778071) 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, 47994 + ... + 48424.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096).

Almost surely, 2^20778079 is an apocalyptic number.

20778079 is a deficient number, since it is larger than the sum of its proper divisors (3607457).

20778079 is an equidigital number, since it uses as much as digits as its factorization.

20778079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 20778079 is about 4558.2978182651. The cubic root of 20778079 is about 274.9171276457.

The spelling of 20778079 in words is "twenty million, seven hundred seventy-eight thousand, seventy-nine".