20278016 has 72 divisors (see below), whose sum is σ = 46603200. Its totient is φ = 8709120.

The previous prime is 20278003. The next prime is 20278021. The reversal of 20278016 is 61087202.

It is a super-2 number, since 2×20278016² = 822395865792512, 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 7 ways as a sum of consecutive naturals, for example, 53315 + ... + 53693.

Almost surely, 2^20278016 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20278016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23301600).

20278016 is an abundant number, since it is smaller than the sum of its proper divisors (26325184).

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

20278016 is a wasteful number, since it uses less digits than its factorization.

20278016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 20278016 is about 4503.1118129578. Note that the first 3 decimals coincide. The cubic root of 20278016 is about 272.6937308783.

The spelling of 20278016 in words is "twenty million, two hundred seventy-eight thousand, sixteen".