20551198 has 32 divisors (see below), whose sum is σ = 35575200. Its totient is φ = 8838144.

The previous prime is 20551183. The next prime is 20551207. The reversal of 20551198 is 89115502.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 18186 + ... + 19282.

It is an arithmetic number, because the mean of its divisors is an integer number (1111725).

Almost surely, 2^20551198 is an apocalyptic number.

20551198 is a deficient number, since it is larger than the sum of its proper divisors (15024002).

20551198 is a wasteful number, since it uses less digits than its factorization.

20551198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 20551198 is about 4533.3429166565. The cubic root of 20551198 is about 273.9128339068.

The spelling of 20551198 in words is "twenty million, five hundred fifty-one thousand, one hundred ninety-eight".