20669278 has 12 divisors (see below), whose sum is σ = 36065952. Its totient is φ = 8858220.

The previous prime is 20669269. The next prime is 20669291. The reversal of 20669278 is 87296602.

It is a self number, because there is not a number n which added to its sum of digits gives 20669278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105358 + ... + 105553.

It is an arithmetic number, because the mean of its divisors is an integer number (3005496).

Almost surely, 2^20669278 is an apocalyptic number.

20669278 is a deficient number, since it is larger than the sum of its proper divisors (15396674).

20669278 is a wasteful number, since it uses less digits than its factorization.

20669278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210927 (or 210920 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 20669278 is about 4546.3477649648. The cubic root of 20669278 is about 274.4364348399.

The spelling of 20669278 in words is "twenty million, six hundred sixty-nine thousand, two hundred seventy-eight".