20078442 has 20 divisors (see below), whose sum is σ = 44990946. Its totient is φ = 6692760.

The previous prime is 20078441. The next prime is 20078449. The reversal of 20078442 is 24487002.

It can be written as a sum of positive squares in only one way, i.e., 13682601 + 6395841 = 3699^2 + 2529^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20078441) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 61809 + ... + 62132.

Almost surely, 2^20078442 is an apocalyptic number.

20078442 is an abundant number, since it is smaller than the sum of its proper divisors (24912504).

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

20078442 is a wasteful number, since it uses less digits than its factorization.

20078442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123955 (or 123946 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20078442 is about 4480.8974547517. The cubic root of 20078442 is about 271.7961726286.

The spelling of 20078442 in words is "twenty million, seventy-eight thousand, four hundred forty-two".