20413178 has 4 divisors (see below), whose sum is σ = 30619770. Its totient is φ = 10206588.

The previous prime is 20413177. The next prime is 20413199. The reversal of 20413178 is 87131402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87131402 = 2 ⋅43565701.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 6848689 = 3683^2 + 2617^2 .

It is not an unprimeable number, because it can be changed into a prime (20413177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5103293 + ... + 5103296.

Almost surely, 2^20413178 is an apocalyptic number.

20413178 is a deficient number, since it is larger than the sum of its proper divisors (10206592).

20413178 is a wasteful number, since it uses less digits than its factorization.

20413178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10206591.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20413178 is about 4518.0945098570. The cubic root of 20413178 is about 273.2982647190.

The spelling of 20413178 in words is "twenty million, four hundred thirteen thousand, one hundred seventy-eight".