20332978 has 8 divisors (see below), whose sum is σ = 30631068. Its totient is φ = 10122624.

The previous prime is 20332957. The next prime is 20332979. The reversal of 20332978 is 87923302.

It can be written as a sum of positive squares in 2 ways, for example, as 20133169 + 199809 = 4487^2 + 447^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20332979) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 21351 + ... + 22282.

Almost surely, 2^20332978 is an apocalyptic number.

20332978 is a deficient number, since it is larger than the sum of its proper divisors (10298090).

20332978 is a wasteful number, since it uses less digits than its factorization.

20332978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43868.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 20332978 is about 4509.2103521570. The cubic root of 20332978 is about 272.9398804047.

The spelling of 20332978 in words is "twenty million, three hundred thirty-two thousand, nine hundred seventy-eight".