20679858 has 36 divisors (see below), whose sum is σ = 45779370. Its totient is φ = 6746688.

The previous prime is 20679853. The next prime is 20679877. The reversal of 20679858 is 85897602.

It can be written as a sum of positive squares in 3 ways, for example, as 20548089 + 131769 = 4533^2 + 363^2 .

It is not an unprimeable number, because it can be changed into a prime (20679853) 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 in 17 ways as a sum of consecutive naturals, for example, 50358 + ... + 50766.

Almost surely, 2^20679858 is an apocalyptic number.

20679858 is an abundant number, since it is smaller than the sum of its proper divisors (25099512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20679858 is a wasteful number, since it uses less digits than its factorization.

20679858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 20679858 is about 4547.5111874519. The cubic root of 20679858 is about 274.4832521857.

The spelling of 20679858 in words is "twenty million, six hundred seventy-nine thousand, eight hundred fifty-eight".