20378907 has 12 divisors (see below), whose sum is σ = 29791944. Its totient is φ = 13421760.

The previous prime is 20378867. The next prime is 20378933. The reversal of 20378907 is 70987302.

It is not a de Polignac number, because 20378907 - 2⁷ = 20378779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20378957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12894 + ... + 14387.

It is an arithmetic number, because the mean of its divisors is an integer number (2482662).

Almost surely, 2^20378907 is an apocalyptic number.

20378907 is a deficient number, since it is larger than the sum of its proper divisors (9413037).

20378907 is a wasteful number, since it uses less digits than its factorization.

20378907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27370 (or 27367 counting only the distinct ones).

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

The square root of 20378907 is about 4514.3002780054. The cubic root of 20378907 is about 273.1452352844.

The spelling of 20378907 in words is "twenty million, three hundred seventy-eight thousand, nine hundred seven".