20378855 has 24 divisors (see below), whose sum is σ = 28651392. Its totient is φ = 13874112.

The previous prime is 20378837. The next prime is 20378863. The reversal of 20378855 is 55887302.

It is not a de Polignac number, because 20378855 - 2⁶ = 20378791 is a prime.

It is a super-2 number, since 2×20378855² = 830595462222050, which contains 22 as substring.

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, 54449 + ... + 54821.

It is an arithmetic number, because the mean of its divisors is an integer number (1193808).

Almost surely, 2^20378855 is an apocalyptic number.

20378855 is a deficient number, since it is larger than the sum of its proper divisors (8272537).

20378855 is a wasteful number, since it uses less digits than its factorization.

20378855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 20378855 is about 4514.2945185267. The cubic root of 20378855 is about 273.1450029598.

The spelling of 20378855 in words is "twenty million, three hundred seventy-eight thousand, eight hundred fifty-five".