20727998 has 16 divisors (see below), whose sum is σ = 33482160. Its totient is φ = 9588096.

The previous prime is 20727989. The next prime is 20728009. The reversal of 20727998 is 89972702.

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 7 ways as a sum of consecutive naturals, for example, 3161 + ... + 7172.

It is an arithmetic number, because the mean of its divisors is an integer number (2092635).

Almost surely, 2^20727998 is an apocalyptic number.

20727998 is a deficient number, since it is larger than the sum of its proper divisors (12754162).

20727998 is a wasteful number, since it uses less digits than its factorization.

20727998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 20727998 is about 4552.8011157967. The cubic root of 20727998 is about 274.6960741468.

The spelling of 20727998 in words is "twenty million, seven hundred twenty-seven thousand, nine hundred ninety-eight".