20378790 has 80 divisors (see below), whose sum is σ = 55495440. Its totient is φ = 5365440.

The previous prime is 20378779. The next prime is 20378791. The reversal of 20378790 is 9787302.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378791) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 112500 + ... + 112680.

It is an arithmetic number, because the mean of its divisors is an integer number (693693).

Almost surely, 2^20378790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20378790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27747720).

20378790 is an abundant number, since it is smaller than the sum of its proper divisors (35116650).

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

20378790 is a wasteful number, since it uses less digits than its factorization.

20378790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 330 counting only the distinct ones).

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

The square root of 20378790 is about 4514.2873191679. The cubic root of 20378790 is about 273.1447125535.

The spelling of 20378790 in words is "twenty million, three hundred seventy-eight thousand, seven hundred ninety".