20397588 has 12 divisors (see below), whose sum is σ = 47594400. Its totient is φ = 6799192.

The previous prime is 20397571. The next prime is 20397631. The reversal of 20397588 is 88579302.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 849888 + ... + 849911.

It is an arithmetic number, because the mean of its divisors is an integer number (3966200).

Almost surely, 2^20397588 is an apocalyptic number.

It is an amenable number.

20397588 is an abundant number, since it is smaller than the sum of its proper divisors (27196812).

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

20397588 is a wasteful number, since it uses less digits than its factorization.

20397588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699806 (or 1699804 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 20397588 is about 4516.3688954734. The cubic root of 20397588 is about 273.2286723364.

The spelling of 20397588 in words is "twenty million, three hundred ninety-seven thousand, five hundred eighty-eight".