20378355 has 16 divisors (see below), whose sum is σ = 34321920. Its totient is φ = 10296288.

The previous prime is 20378333. The next prime is 20378357. The reversal of 20378355 is 55387302.

It is not a de Polignac number, because 20378355 - 2¹⁶ = 20312819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20378357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35467 + ... + 36036.

It is an arithmetic number, because the mean of its divisors is an integer number (2145120).

Almost surely, 2^20378355 is an apocalyptic number.

20378355 is a deficient number, since it is larger than the sum of its proper divisors (13943565).

20378355 is a wasteful number, since it uses less digits than its factorization.

20378355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71530.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 20378355 is about 4514.2391385482. The cubic root of 20378355 is about 273.1427690492.

The spelling of 20378355 in words is "twenty million, three hundred seventy-eight thousand, three hundred fifty-five".