20278416 has 40 divisors (see below), whose sum is σ = 55469664. Its totient is φ = 6361600.

The previous prime is 20278411. The next prime is 20278441. The reversal of 20278416 is 61487202.

It is a super-2 number, since 2×20278416² = 822428310938112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20278411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11610 + ... + 13241.

Almost surely, 2^20278416 is an apocalyptic number.

It is an amenable number.

20278416 is an abundant number, since it is smaller than the sum of its proper divisors (35191248).

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

20278416 is a wasteful number, since it uses less digits than its factorization.

20278416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24879 (or 24873 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20278416 is about 4503.1562264705. The cubic root of 20278416 is about 272.6955239001.

The spelling of 20278416 in words is "twenty million, two hundred seventy-eight thousand, four hundred sixteen".