20828878 has 8 divisors (see below), whose sum is σ = 35706672. Its totient is φ = 8926656.

The previous prime is 20828867. The next prime is 20828879. The reversal of 20828878 is 87882802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743875 + ... + 743902.

It is an arithmetic number, because the mean of its divisors is an integer number (4463334).

Almost surely, 2^20828878 is an apocalyptic number.

20828878 is a deficient number, since it is larger than the sum of its proper divisors (14877794).

20828878 is a wasteful number, since it uses less digits than its factorization.

20828878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487786.

The product of its (nonzero) digits is 114688, while the sum is 43.

The square root of 20828878 is about 4563.8665624665. The cubic root of 20828878 is about 275.1409877607.

The spelling of 20828878 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred seventy-eight".