20555898 has 16 divisors (see below), whose sum is σ = 44849376. Its totient is φ = 6229040.

The previous prime is 20555897. The next prime is 20555911. The reversal of 20555898 is 89855502.

It is not an unprimeable number, because it can be changed into a prime (20555897) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 155661 + ... + 155792.

It is an arithmetic number, because the mean of its divisors is an integer number (2803086).

Almost surely, 2^20555898 is an apocalyptic number.

20555898 is an abundant number, since it is smaller than the sum of its proper divisors (24293478).

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

20555898 is a wasteful number, since it uses less digits than its factorization.

20555898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311469.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 20555898 is about 4533.8612682789. The cubic root of 20555898 is about 273.9337133415.

The spelling of 20555898 in words is "twenty million, five hundred fifty-five thousand, eight hundred ninety-eight".