20920998 has 16 divisors (see below), whose sum is σ = 47819520. Its totient is φ = 5977416.

The previous prime is 20920993. The next prime is 20921009. The reversal of 20920998 is 89902902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20920993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249018 + ... + 249101.

It is an arithmetic number, because the mean of its divisors is an integer number (2988720).

Almost surely, 2^20920998 is an apocalyptic number.

20920998 is an abundant number, since it is smaller than the sum of its proper divisors (26898522).

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

20920998 is a wasteful number, since it uses less digits than its factorization.

20920998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498131.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 20920998 is about 4573.9477478432. The cubic root of 20920998 is about 275.5460137921.

The spelling of 20920998 in words is "twenty million, nine hundred twenty thousand, nine hundred ninety-eight".