20078394 has 64 divisors (see below), whose sum is σ = 49496832. Its totient is φ = 5299200.

The previous prime is 20078393. The next prime is 20078417. The reversal of 20078394 is 49387002.

It is not an unprimeable number, because it can be changed into a prime (20078393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43324 + ... + 43784.

It is an arithmetic number, because the mean of its divisors is an integer number (773388).

Almost surely, 2^20078394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20078394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24748416).

20078394 is an abundant number, since it is smaller than the sum of its proper divisors (29418438).

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

20078394 is a wasteful number, since it uses less digits than its factorization.

20078394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20078394 is about 4480.8920986786. The cubic root of 20078394 is about 271.7959560410.

It can be divided in two parts, 2007 and 8394, that added together give a palindrome (10401).

The spelling of 20078394 in words is "twenty million, seventy-eight thousand, three hundred ninety-four".