20604778 has 16 divisors (see below), whose sum is σ = 33023520. Its totient is φ = 9613296.

The previous prime is 20604767. The next prime is 20604781. The reversal of 20604778 is 87740602.

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, 1501 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2063970).

Almost surely, 2^20604778 is an apocalyptic number.

20604778 is a deficient number, since it is larger than the sum of its proper divisors (12418742).

20604778 is a wasteful number, since it uses less digits than its factorization.

20604778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8181.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 20604778 is about 4539.2486162360. The cubic root of 20604778 is about 274.1506710344.

The spelling of 20604778 in words is "twenty million, six hundred four thousand, seven hundred seventy-eight".