20339778 has 16 divisors (see below), whose sum is σ = 41369760. Its totient is φ = 6664896.

The previous prime is 20339749. The next prime is 20339789. The reversal of 20339778 is 87793302.

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 in 7 ways as a sum of consecutive naturals, for example, 28375 + ... + 29082.

It is an arithmetic number, because the mean of its divisors is an integer number (2585610).

Almost surely, 2^20339778 is an apocalyptic number.

20339778 is an abundant number, since it is smaller than the sum of its proper divisors (21029982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20339778 is a wasteful number, since it uses less digits than its factorization.

20339778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57521.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 20339778 is about 4509.9643014108. The cubic root of 20339778 is about 272.9703036302.

It can be divided in two parts, 2033 and 9778, that added together give a palindrome (11811).

The spelling of 20339778 in words is "twenty million, three hundred thirty-nine thousand, seven hundred seventy-eight".