20670158 has 4 divisors (see below), whose sum is σ = 31005240. Its totient is φ = 10335078.

The previous prime is 20670151. The next prime is 20670163. The reversal of 20670158 is 85107602.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20670158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20670151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5167538 + ... + 5167541.

It is an arithmetic number, because the mean of its divisors is an integer number (7751310).

Almost surely, 2^20670158 is an apocalyptic number.

20670158 is a deficient number, since it is larger than the sum of its proper divisors (10335082).

20670158 is a wasteful number, since it uses less digits than its factorization.

20670158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335081.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20670158 is about 4546.4445449164. Note that the first 3 decimals coincide. The cubic root of 20670158 is about 274.4403295193.

The spelling of 20670158 in words is "twenty million, six hundred seventy thousand, one hundred fifty-eight".