20478229 has 8 divisors (see below), whose sum is σ = 21426048. Its totient is φ = 19551840.

The previous prime is 20478223. The next prime is 20478239. The reversal of 20478229 is 92287402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20478229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20478194 and 20478203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478223) 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, 3387 + ... + 7240.

It is an arithmetic number, because the mean of its divisors is an integer number (2678256).

Almost surely, 2^20478229 is an apocalyptic number.

It is an amenable number.

20478229 is a deficient number, since it is larger than the sum of its proper divisors (947819).

20478229 is a wasteful number, since it uses less digits than its factorization.

20478229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 20478229 is about 4525.2877256590. The cubic root of 20478229 is about 273.5882648675.

The spelling of 20478229 in words is "twenty million, four hundred seventy-eight thousand, two hundred twenty-nine".