20320998 has 16 divisors (see below), whose sum is σ = 41045616. Its totient is φ = 6706400.

The previous prime is 20320987. The next prime is 20320999. The reversal of 20320998 is 89902302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320999) 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, 16161 + ... + 17372.

It is an arithmetic number, because the mean of its divisors is an integer number (2565351).

Almost surely, 2^20320998 is an apocalyptic number.

20320998 is an abundant number, since it is smaller than the sum of its proper divisors (20724618).

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

20320998 is a wasteful number, since it uses less digits than its factorization.

20320998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33639.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 20320998 is about 4507.8817641992. The cubic root of 20320998 is about 272.8862653340.

The spelling of 20320998 in words is "twenty million, three hundred twenty thousand, nine hundred ninety-eight".