20805378 has 32 divisors (see below), whose sum is σ = 46455552. Its totient is φ = 6157200.

The previous prime is 20805377. The next prime is 20805397. The reversal of 20805378 is 87350802.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20805373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1451736).

Almost surely, 2^20805378 is an apocalyptic number.

20805378 is an abundant number, since it is smaller than the sum of its proper divisors (25650174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20805378 is a wasteful number, since it uses less digits than its factorization.

20805378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 20805378 is about 4561.2912645434. The cubic root of 20805378 is about 275.0374736812.

The spelling of 20805378 in words is "twenty million, eight hundred five thousand, three hundred seventy-eight".