20878198 has 16 divisors (see below), whose sum is σ = 34319376. Its totient is φ = 9447040.

The previous prime is 20878171. The next prime is 20878201. The reversal of 20878198 is 89187802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3090 + ... + 7162.

It is an arithmetic number, because the mean of its divisors is an integer number (2144961).

Almost surely, 2^20878198 is an apocalyptic number.

20878198 is a deficient number, since it is larger than the sum of its proper divisors (13441178).

20878198 is a wasteful number, since it uses less digits than its factorization.

20878198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4319.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 20878198 is about 4569.2666807706. The cubic root of 20878198 is about 275.3579822779.

The spelling of 20878198 in words is "twenty million, eight hundred seventy-eight thousand, one hundred ninety-eight".