20878898 has 8 divisors (see below), whose sum is σ = 32398380. Its totient is φ = 10079440.

The previous prime is 20878889. The next prime is 20878901. The reversal of 20878898 is 89887802.

It can be written as a sum of positive squares in 2 ways, for example, as 19864849 + 1014049 = 4457^2 + 1007^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179933 + ... + 180048.

Almost surely, 2^20878898 is an apocalyptic number.

20878898 is a deficient number, since it is larger than the sum of its proper divisors (11519482).

20878898 is a wasteful number, since it uses less digits than its factorization.

20878898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360012.

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 20878898 is about 4569.3432788531. The cubic root of 20878898 is about 275.3610596257.

The spelling of 20878898 in words is "twenty million, eight hundred seventy-eight thousand, eight hundred ninety-eight".