20678199 has 8 divisors (see below), whose sum is σ = 27948912. Its totient is φ = 13596480.

The previous prime is 20678197. The next prime is 20678263. The reversal of 20678199 is 99187602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20678199 - 2¹ = 20678197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20678199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20678191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46992 + ... + 47429.

It is an arithmetic number, because the mean of its divisors is an integer number (3493614).

Almost surely, 2^20678199 is an apocalyptic number.

20678199 is a deficient number, since it is larger than the sum of its proper divisors (7270713).

20678199 is an equidigital number, since it uses as much as digits as its factorization.

20678199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94497.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 20678199 is about 4547.3287763257. The cubic root of 20678199 is about 274.4759120339.

The spelling of 20678199 in words is "twenty million, six hundred seventy-eight thousand, one hundred ninety-nine".