20378816 has 14 divisors (see below), whose sum is σ = 40439340. Its totient is φ = 10189376.

The previous prime is 20378807. The next prime is 20378821. The reversal of 20378816 is 61887302.

It is a super-2 number, since 2×20378816² = 830592283123712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159146 + ... + 159273.

Almost surely, 2^20378816 is an apocalyptic number.

It is an amenable number.

20378816 is a deficient number, since it is larger than the sum of its proper divisors (20060524).

20378816 is an equidigital number, since it uses as much as digits as its factorization.

20378816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318431 (or 318421 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20378816 is about 4514.2901989128. The cubic root of 20378816 is about 273.1448287161.

The spelling of 20378816 in words is "twenty million, three hundred seventy-eight thousand, eight hundred sixteen".