20378215 has 24 divisors (see below), whose sum is σ = 28957824. Its totient is φ = 13675200.

The previous prime is 20378201. The next prime is 20378221. The reversal of 20378215 is 51287302.

It is not a de Polignac number, because 20378215 - 2⁹ = 20377703 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6570 + ... + 9160.

It is an arithmetic number, because the mean of its divisors is an integer number (1206576).

Almost surely, 2^20378215 is an apocalyptic number.

20378215 is a deficient number, since it is larger than the sum of its proper divisors (8579609).

20378215 is a wasteful number, since it uses less digits than its factorization.

20378215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2631 (or 2620 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20378215 is about 4514.2236320324. The cubic root of 20378215 is about 273.1421435477.

The spelling of 20378215 in words is "twenty million, three hundred seventy-eight thousand, two hundred fifteen".