20679867 has 40 divisors (see below), whose sum is σ = 34151040. Its totient is φ = 12389760.

The previous prime is 20679853. The next prime is 20679877. The reversal of 20679867 is 76897602.

It is a happy number.

It is not a de Polignac number, because 20679867 - 2¹⁰ = 20678843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20679817) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42934 + ... + 43412.

It is an arithmetic number, because the mean of its divisors is an integer number (853776).

Almost surely, 2^20679867 is an apocalyptic number.

20679867 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20679867 is a deficient number, since it is larger than the sum of its proper divisors (13471173).

20679867 is a wasteful number, since it uses less digits than its factorization.

20679867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 20679867 is about 4547.5121770040. The cubic root of 20679867 is about 274.4832920046.

The spelling of 20679867 in words is "twenty million, six hundred seventy-nine thousand, eight hundred sixty-seven".