20478976 has 44 divisors (see below), whose sum is σ = 46802608. Its totient is φ = 8773632.

The previous prime is 20478973. The next prime is 20478977. The reversal of 20478976 is 67987402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20478973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5740 + ... + 8596.

Almost surely, 2^20478976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20478976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23401304).

20478976 is an abundant number, since it is smaller than the sum of its proper divisors (26323632).

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

20478976 is an equidigital number, since it uses as much as digits as its factorization.

20478976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 2866 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 20478976 is about 4525.3702610947. The cubic root of 20478976 is about 273.5915914564.

The spelling of 20478976 in words is "twenty million, four hundred seventy-eight thousand, nine hundred seventy-six".