20336978 has 4 divisors (see below), whose sum is σ = 30505470. Its totient is φ = 10168488.

The previous prime is 20336969. The next prime is 20336983. The reversal of 20336978 is 87963302.

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

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 418609 = 4463^2 + 647^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5084243 + ... + 5084246.

Almost surely, 2^20336978 is an apocalyptic number.

20336978 is a deficient number, since it is larger than the sum of its proper divisors (10168492).

20336978 is a wasteful number, since it uses less digits than its factorization.

20336978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168491.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20336978 is about 4509.6538669836. The cubic root of 20336978 is about 272.9577772410.

The spelling of 20336978 in words is "twenty million, three hundred thirty-six thousand, nine hundred seventy-eight".