20479788 has 72 divisors (see below), whose sum is σ = 59623200. Its totient is φ = 5806080.

The previous prime is 20479751. The next prime is 20479793. The reversal of 20479788 is 88797402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45388 + ... + 45836.

It is an arithmetic number, because the mean of its divisors is an integer number (828100).

Almost surely, 2^20479788 is an apocalyptic number.

20479788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20479788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29811600).

20479788 is an abundant number, since it is smaller than the sum of its proper divisors (39143412).

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

20479788 is a wasteful number, since it uses less digits than its factorization.

20479788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 20479788 is about 4525.4599766212. The cubic root of 20479788 is about 273.5952074158.

The spelling of 20479788 in words is "twenty million, four hundred seventy-nine thousand, seven hundred eighty-eight".