20332778 has 4 divisors (see below), whose sum is σ = 30499170. Its totient is φ = 10166388.

The previous prime is 20332777. The next prime is 20332817. The reversal of 20332778 is 87723302.

It is a happy number.

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., 19598329 + 734449 = 4427^2 + 857^2 .

It is a super-2 number, since 2×20332778² = 826843722394568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20332771) 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 as a sum of consecutive naturals, namely, 5083193 + ... + 5083196.

Almost surely, 2^20332778 is an apocalyptic number.

20332778 is a deficient number, since it is larger than the sum of its proper divisors (10166392).

20332778 is a wasteful number, since it uses less digits than its factorization.

20332778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10166391.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 20332778 is about 4509.1881752706. The cubic root of 20332778 is about 272.9389855013.

The spelling of 20332778 in words is "twenty million, three hundred thirty-two thousand, seven hundred seventy-eight".