20670778 has 8 divisors (see below), whose sum is σ = 31059072. Its totient is φ = 10317756.

The previous prime is 20670763. The next prime is 20670817. The reversal of 20670778 is 87707602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7300 + ... + 9727.

It is an arithmetic number, because the mean of its divisors is an integer number (3882384).

Almost surely, 2^20670778 is an apocalyptic number.

20670778 is a deficient number, since it is larger than the sum of its proper divisors (10388294).

20670778 is a wasteful number, since it uses less digits than its factorization.

20670778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17636.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 20670778 is about 4546.5127295544. The cubic root of 20670778 is about 274.4430734316.

The spelling of 20670778 in words is "twenty million, six hundred seventy thousand, seven hundred seventy-eight".