20378990 has 32 divisors (see below), whose sum is σ = 38054016. Its totient is φ = 7852320.

The previous prime is 20378957. The next prime is 20378999. The reversal of 20378990 is 9987302.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35405 + ... + 35975.

It is an arithmetic number, because the mean of its divisors is an integer number (1189188).

Almost surely, 2^20378990 is an apocalyptic number.

20378990 is a deficient number, since it is larger than the sum of its proper divisors (17675026).

20378990 is a wasteful number, since it uses less digits than its factorization.

20378990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 20378990 is about 4514.3094710044. The cubic root of 20378990 is about 273.1456061094.

The spelling of 20378990 in words is "twenty million, three hundred seventy-eight thousand, nine hundred ninety".