20039778 has 48 divisors (see below), whose sum is σ = 48965280. Its totient is φ = 6070680.

The previous prime is 20039771. The next prime is 20039797. The reversal of 20039778 is 87793002.

It is not an unprimeable number, because it can be changed into a prime (20039771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5001 + ... + 8067.

It is an arithmetic number, because the mean of its divisors is an integer number (1020110).

Almost surely, 2^20039778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20039778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24482640).

20039778 is an abundant number, since it is smaller than the sum of its proper divisors (28925502).

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

20039778 is a wasteful number, since it uses less digits than its factorization.

20039778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100 (or 3083 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20039778 is about 4476.5810614798. The cubic root of 20039778 is about 271.6215993257.

It can be divided in two parts, 2003 and 9778, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 20039778 in words is "twenty million, thirty-nine thousand, seven hundred seventy-eight".