20687488 has 32 divisors (see below), whose sum is σ = 43011360. Its totient is φ = 9892608.

The previous prime is 20687467. The next prime is 20687489. The reversal of 20687488 is 88478602.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20687489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 570 + ... + 6457.

It is an arithmetic number, because the mean of its divisors is an integer number (1344105).

Almost surely, 2^20687488 is an apocalyptic number.

It is an amenable number.

20687488 is an abundant number, since it is smaller than the sum of its proper divisors (22323872).

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

20687488 is an equidigital number, since it uses as much as digits as its factorization.

20687488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064 (or 7052 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 43.

The square root of 20687488 is about 4548.3500305056. The cubic root of 20687488 is about 274.5170056363.

The spelling of 20687488 in words is "twenty million, six hundred eighty-seven thousand, four hundred eighty-eight".