20457078 has 32 divisors (see below), whose sum is σ = 43017216. Its totient is φ = 6477408.

The previous prime is 20457067. The next prime is 20457119. The reversal of 20457078 is 87075402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8475 + ... + 10617.

It is an arithmetic number, because the mean of its divisors is an integer number (1344288).

Almost surely, 2^20457078 is an apocalyptic number.

20457078 is an abundant number, since it is smaller than the sum of its proper divisors (22560138).

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

20457078 is a wasteful number, since it uses less digits than its factorization.

20457078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20457078 is about 4522.9501434351. The cubic root of 20457078 is about 273.4940402678.

The spelling of 20457078 in words is "twenty million, four hundred fifty-seven thousand, seventy-eight".