20578420 has 24 divisors (see below), whose sum is σ = 44610048. Its totient is φ = 7965600.

The previous prime is 20578409. The next prime is 20578421. The reversal of 20578420 is 2487502.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15976 + ... + 17215.

It is an arithmetic number, because the mean of its divisors is an integer number (1858752).

Almost surely, 2^20578420 is an apocalyptic number.

20578420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20578420 is an abundant number, since it is smaller than the sum of its proper divisors (24031628).

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

20578420 is a wasteful number, since it uses less digits than its factorization.

20578420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33231 (or 33229 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20578420 is about 4536.3443431909. The cubic root of 20578420 is about 274.0337216741.

The spelling of 20578420 in words is "twenty million, five hundred seventy-eight thousand, four hundred twenty".