20479998 has 64 divisors (see below), whose sum is σ = 51706368. Its totient is φ = 5253120.

The previous prime is 20479937. The next prime is 20479999. The reversal of 20479998 is 89997402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20479999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44586 + ... + 45042.

It is an arithmetic number, because the mean of its divisors is an integer number (807912).

Almost surely, 2^20479998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20479998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25853184).

20479998 is an abundant number, since it is smaller than the sum of its proper divisors (31226370).

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

20479998 is a wasteful number, since it uses less digits than its factorization.

20479998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 20479998 is about 4525.4831786230. The cubic root of 20479998 is about 273.5961425621.

The spelling of 20479998 in words is "twenty million, four hundred seventy-nine thousand, nine hundred ninety-eight".