20378740 has 12 divisors (see below), whose sum is σ = 42795396. Its totient is φ = 8151488.

The previous prime is 20378737. The next prime is 20378747. The reversal of 20378740 is 4787302.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 10719076 = 3108^2 + 3274^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20378747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509449 + ... + 509488.

It is an arithmetic number, because the mean of its divisors is an integer number (3566283).

Almost surely, 2^20378740 is an apocalyptic number.

20378740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20378740 is an abundant number, since it is smaller than the sum of its proper divisors (22416656).

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

20378740 is a wasteful number, since it uses less digits than its factorization.

20378740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018946 (or 1018944 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 20378740 is about 4514.2817811918. The cubic root of 20378740 is about 273.1444891636.

The spelling of 20378740 in words is "twenty million, three hundred seventy-eight thousand, seven hundred forty".