20417988 has 24 divisors (see below), whose sum is σ = 47988640. Its totient is φ = 6756480.

The previous prime is 20417987. The next prime is 20418011. The reversal of 20417988 is 88971402.

It is not an unprimeable number, because it can be changed into a prime (20417987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4453 + ... + 7788.

Almost surely, 2^20417988 is an apocalyptic number.

It is an amenable number.

20417988 is an abundant number, since it is smaller than the sum of its proper divisors (27570652).

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

20417988 is a wasteful number, since it uses less digits than its factorization.

20417988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12387 (or 12385 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20417988 is about 4518.6267825524. The cubic root of 20417988 is about 273.3197289812.

The spelling of 20417988 in words is "twenty million, four hundred seventeen thousand, nine hundred eighty-eight".