20288420 has 24 divisors (see below), whose sum is σ = 42713664. Its totient is φ = 8094816.

The previous prime is 20288419. The next prime is 20288441. The reversal of 20288420 is 2488202.

It is a self number, because there is not a number n which added to its sum of digits gives 20288420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8699 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (1779736).

Almost surely, 2^20288420 is an apocalyptic number.

20288420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20288420 is an abundant number, since it is smaller than the sum of its proper divisors (22425244).

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

20288420 is a wasteful number, since it uses less digits than its factorization.

20288420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579 (or 2577 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 20288420 is about 4504.2668659839. The cubic root of 20288420 is about 272.7403597087.

The spelling of 20288420 in words is "twenty million, two hundred eighty-eight thousand, four hundred twenty".