20801378 has 8 divisors (see below), whose sum is σ = 33602268. Its totient is φ = 9600624.

The previous prime is 20801317. The next prime is 20801383. The reversal of 20801378 is 87310802.

It can be written as a sum of positive squares in 2 ways, for example, as 17749369 + 3052009 = 4213^2 + 1747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20801378.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400001 + ... + 400052.

Almost surely, 2^20801378 is an apocalyptic number.

20801378 is a deficient number, since it is larger than the sum of its proper divisors (12800890).

20801378 is a wasteful number, since it uses less digits than its factorization.

20801378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800068.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20801378 is about 4560.8527711383. The cubic root of 20801378 is about 275.0198465015.

The spelling of 20801378 in words is "twenty million, eight hundred one thousand, three hundred seventy-eight".