20789278 has 4 divisors (see below), whose sum is σ = 31183920. Its totient is φ = 10394638.

The previous prime is 20789273. The next prime is 20789311. The reversal of 20789278 is 87298702.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×20789278² = 864388159522568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20789273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5197318 + ... + 5197321.

It is an arithmetic number, because the mean of its divisors is an integer number (7795980).

Almost surely, 2^20789278 is an apocalyptic number.

20789278 is a deficient number, since it is larger than the sum of its proper divisors (10394642).

20789278 is a wasteful number, since it uses less digits than its factorization.

20789278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10394641.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 20789278 is about 4559.5260718632. The cubic root of 20789278 is about 274.9665105224.

The spelling of 20789278 in words is "twenty million, seven hundred eighty-nine thousand, two hundred seventy-eight".