20478930 has 32 divisors (see below), whose sum is σ = 50846400. Its totient is φ = 5272512.

The previous prime is 20478929. The next prime is 20478937. The reversal of 20478930 is 3987402.

It is a junction number, because it is equal to n+sod(n) for n = 20478891 and 20478900.

It is not an unprimeable number, because it can be changed into a prime (20478937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10900 + ... + 12639.

It is an arithmetic number, because the mean of its divisors is an integer number (1588950).

Almost surely, 2^20478930 is an apocalyptic number.

20478930 is an abundant number, since it is smaller than the sum of its proper divisors (30367470).

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

20478930 is a wasteful number, since it uses less digits than its factorization.

20478930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23578.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20478930 is about 4525.3651786348. The cubic root of 20478930 is about 273.5913866086.

The spelling of 20478930 in words is "twenty million, four hundred seventy-eight thousand, nine hundred thirty".